open

adj

1. (not-comparable, usually)Physically unobstructed, uncovered, etc.

   “Come in – the door's open.”

   “The ice has cleared and the channel is open again.”

2. (not-comparable, usually)Physically unobstructed, uncovered, etc.

   “The jewellery box was lying open.”

   “Don't just stand there with your mouth open!”

   “Along the street ran an open sewer.”

3. (not-comparable, usually)Physically unobstructed, uncovered, etc.

   “She greeted them with open arms.”

   “The book was open at page 23.”

   “an open hand; an open flower; an open (loosely woven) fabric”

   “Each, with open arms, embraced her chosen knight.”

   “When the top sheet, blanket, and bedspread of a closed bed are turned back, or fanfolded, the closed bed becomes an open bed, or a bed ready to receive a patient or resident.”

4. (not-comparable, usually)Physically unobstructed, uncovered, etc.

   “It was a large, open room.”

   “Most of the site was occupied by huts, but there was an open area in the centre.”

   “Soon we left the forest behind and we were out in open country.”

   “The open road, the dusty highway[…]”

5. (not-comparable, usually)Physically unobstructed, uncovered, etc.

   “an open fracture”

6. (not-comparable, proscribed, sometimes, usually)Physically unobstructed, uncovered, etc.
7. (not-comparable, usually)Physically unobstructed, uncovered, etc.
8. (not-comparable, usually)Physically unobstructed, uncovered, etc.

   “open sandwich”

   “Starry food is fun to make. You can buy bright yellow American mustard (which isn’t too strong!) in squeezy bottles and pipe stars on to hot dogs and open burgers or sandwiches.”

   “When the burgers are ready, place them on the toasted rolls with the romaine lettuce leaves and top with the salsa. Serve as open burgers.”

   “Sunday morning in Wellow and we feast on open bagels with grilled ham, tomato and Swiss cheese, requested and highly praised.”

9. (not-comparable, regional, usually)Physically unobstructed, uncovered, etc.

   “an open winter”

   “He desires me to tell you that the present open weather induces him to accept Mr Vernon's invitation to prolong his stay in Sussex that they may have some hunting together.”

10. (not-comparable)Able to be used or interacted with in some way.

    “Your bank account is now open.”

    “Phone lines open at 10 pm.”

    “This is the only option open to us.”

11. (not-comparable)Able to be used or interacted with in some way.

    “Banks are not open on bank holidays.”

    “Several new shops have opened in Market Street.”

12. (not-comparable)Able to be used or interacted with in some way.

    “I hereby declare this fete open.”

    “The school has an open day on Saturday.”

13. (comparable)Able to be used or interacted with in some way.

    “I am open to new ideas.”

    “Wherefore if Demetrius […] have a matter against any man, the law is open and there are deputies.”

    “A U.K. survey found attitudes toward public transit had been set back by two decades, with only 43% of drivers open to using their car less, even if public transport improves.”

14. (comparable)Able to be used or interacted with in some way.

    “open to question; open to attack; open to criticism”

    “The service that I truly did his life, / Hath left me open to all injuries.”

15. (not-comparable, usually)Able to be used or interacted with in some way.

    “I couldn't save my changes because another user had the same file open.”

16. Able to be used or interacted with in some way.

    “You're getting short of memory because you have too many apps open.”

17. Not hidden or restricted.

    “It is a blatant example of open criminality.”

    “His thefts were too open.”

    “That I may find him, and with secret gaze / Or open admiration him behold.”

18. Not hidden or restricted.

    “Nowadays people are more open about their sexuality.”

    “1731-1735, Alexander Pope, Moral Essays with aspect open, shall erect his head”

    “The Moor is of a free and open nature.”

    “The French are always open, familiar, and talkative.”

    “Due to severe and pervasive discrimination, people dared not be open about their homosexuality, and because no one would be open, social prejudice and discrimination became even stronger.”

19. (not-comparable)Not hidden or restricted.

    “He published an open letter to the governor on a full page of The New York Times.”

20. Not hidden or restricted.

    “You will observe that this is an open letter and we reserve the right to mention it to the judge should the matter come to trial.”

21. (not-comparable)Not hidden or restricted.

    “We hope that all aspects of the project will be open rather than paywalled.”

22. Not hidden or restricted.

    “Since the launch early last year of […] two Silicon Valley start-ups offering free education through MOOCs, massive open online courses, the ivory towers of academia have been shaken to their foundations. University brands built in some cases over centuries have been forced to contemplate the possibility that information technology will rapidly make their existing business model obsolete.”

23. Not hidden or restricted.
24. Not hidden or restricted.

    “Compared to their last match, which was a dour and defensive affair, this was a very open game.”

25. Not completed or finalised.

    “an open question”

    “to keep an offer or opportunity open”

26. (sometimes)Not completed or finalised.

    “I've got open orders for as many containers of red durum as you can get me.”

27. Not completed or finalised.

    “an open curve, an open circuit”

28. Not completed or finalised.
29. Not completed or finalised.
30. Not completed or finalised.
31. Having a free variable.
32. Which is part of a predefined collection of subsets of X, that defines a topological space on X.
33. Of a note, played without pressing the string against the fingerboard.
34. Of a note, played without closing any finger-hole, key or valve.
35. Uttered with a relatively wide opening of the articulating organs; said of vowels.

    “"Supposing somebody sees you, with all those flowers too? Supposing somebody writes him a letter? Ooooh!" (a pure round open Tamil O.)”

36. Uttered, as a consonant, with the oral passage simply narrowed without closure.
37. Source code of a computer program that is not within the text of a macro being generated.
38. Having component words separated by spaces, as opposed to being joined together or hyphenated; for example, time slot as opposed to timeslot or time-slot.
39. (especially)Of a club, bat or other hitting implement, angled upwards and/or (for a right-hander) clockwise of straight.

verb

1. (intransitive, transitive)To make or become physically unobstructed, uncovered, etc.

   “Turn the doorknob to open the door.”

   “The door opened all by itself.”

   “I made a speaking trumpet of my hands and commenced to whoop “Ahoy!” and “Hello!” at the top of my lungs. […] The Colonel woke up, and, after asking what in brimstone was the matter, opened his mouth and roared “Hi!” and “Hello!” like the bull of Bashan.”

   “‘No. I only opened the door a foot and put my head in. The street lamps shine into that room. I could see him. He was all right. Sleeping like a great grampus. Poor, poor chap.’”

2. (intransitive, transitive)To make or become physically unobstructed, uncovered, etc.

   “The icebreaker opened the channel.”

   “The ice melted away and the channel opened.”

   “He opened a path through the undergrowth.”

   “After we left the forest, the country opened into a wide, flat plain.”

   “I stumbled along through the young pines and huckleberry bushes. Pretty soon I struck into a sort of path that, I cal'lated, might lead to the road I was hunting for. It twisted and turned, and, the first thing I knew, made a sudden bend around a bunch of bayberry scrub and opened out into a big clear space like a lawn.”

3. (intransitive, transitive)To make or become physically unobstructed, uncovered, etc.

   “You can open your eyes now!”

   “Her eyes opened wide.”

   “He had kept on recording everything then, when he had been sure he was going to die, and he went on recording everything now, when he was suddenly consumed with hate for the boy in his arms and overwhelmed by a desire to put something—his motorcycle key would do nicely — into the interfering little prayboy’s throat and open him like a can of beer.”

4. (intransitive, transitive)To make or become physically unobstructed, uncovered, etc.

   “to open a closed fist”

   “to open matted cotton by separating the fibres”

   “to open a map, book, scroll, padlock”

   “The flower opened in the sunlight.”

   “Her arms opened in welcome.”

5. (transitive)To make or become physically unobstructed, uncovered, etc.

   “Follow agency policy, or open the bed by folding the top linens back.”

6. (intransitive, transitive)To make or become physically unobstructed, uncovered, etc.

   “Jeff opens his hand revealing a straight flush.”

7. (intransitive, transitive)To make or become physically unobstructed, uncovered, etc.
8. (especially, intransitive, transitive)To make or become physically unobstructed, uncovered, etc.
9. (intransitive, transitive)To cause or allow a gap to form or widen.

   “Mudchester Rovers opened a sizeable lead on their rivals.”

   “A link opened under the strain, and the chain came apart.”

10. (intransitive, transitive)To cause or allow a gap to form or widen.
11. (intransitive, transitive)To make or become available for use or interaction.

    “He opened a secret bank account in Switzerland.”

    “We're opening the phone lines in ten minutes.”

    “Phone lines will open in ten minutes.”

12. (intransitive, transitive)To make or become available for use or interaction.

    “I will open the shop an hour early tomorrow.”

    “The summer fete was opened by the mayor.”

    “The shop opens at 9:00.”

    “The fete opened an hour late because of bad weather.”

    “Suiping was opened as a main station in 1912 when Rev. H. M. Nesse arrived to take charge of the mission work.”

13. (intransitive, transitive)To make or become available for use or interaction.

    “Reading this book will open you to new ideas.”

    “This policy will open the government to criticism.”

    “As he grew older, he opened to new ways of doing things.”

14. (intransitive, transitive)To make or become available for use or interaction.

    “I can't open the file because someone else is editing it.”

15. (Manglish, Quebec)To make or become available for use or interaction.

    “Please open the lights, the (electric) fan, the TV.”

16. (intransitive, transitive)To start or begin.

    “The show was opened by a terrible Elvis impersonator.”

    “Our band opened, and they came on second.”

    “Vermont will open elk hunting season next week.”

17. (intransitive)To start or begin.

    “Our band opened for Nirvana.”

18. (intransitive)To start or begin.

    “The meeting opened with a statement from the chairman.”

19. (transitive)To start or begin.

    “I don't want to open that subject.”

20. (transitive)To start or begin.

    “to open a discussion”

    “to open fire upon an enemy”

    “to open trade, or correspondence”

    “to open a case in court, or a meeting”

21. (intransitive, transitive)To start or begin.

    “Click this icon to open Microsoft Word.”

22. (intransitive)To start or begin.
23. (intransitive)To start or begin.

    “After the first two players fold, Julie opens for $5.”

24. (transitive)To make an open relationship or marriage, i.e., with possible additional relationships.

    “He assured me, unequivocally, that he was, and that he rather enjoyed the side benefits of my trysts: I was happier and living more honestly, as well as off his back about many of the issues that had been troublesome for me before we opened our relationship.”

    “I wouldn’t do it unless there is a reason for it, I wouldn’t open a marriage just for fun. I think it’s too dangerous. I know I’m a monogamous type of person—I like just one person at a time; actually sleeping with more than one person in separate relationships is too confusing.”

    “Social situations involved in opening relationships are uncertain, rather than risky, environments. Although some people might say, “Absolutely not,” it may be difficult to predict the likelihood people will respond favorably to the prospect, in part because a wide range of unknown or unknowable factors may drive their willingness.”

25. (obsolete)To disclose; to reveal; to interpret; to explain.

    “The king opened himself to some of his council, that he was sorry for the earl's death.”

    “Unto thee have I opened my cause.”

noun

1. Open or unobstructed space; an exposed location.

   “I can't believe you left the lawnmower out in the open when you knew it was going to rain this afternoon!”

   “Wary of hunters, the fleeing deer kept well out of the open, dodging instead from thicket to thicket.”

2. Public knowledge or scrutiny; full view.

   “We have got to bring this company's corrupt business practices into the open.”

3. A defect in an electrical circuit preventing current from flowing.

   “The electrician found the open in the circuit after a few minutes of testing.”

4. A sports event in which anybody can compete, especially or originally irrespective of amateur or professional status.

   “the Australian Open”

5. The act of something being opened, such as an e-mail message.

   “The total number of opens from original, or unique, subscribers.”