similar

adj

1. Having traits or characteristics in common; alike, allied, comparable.

   “My new car is quite similar to my old one, except it has a bit more space in the back.”

   “So this was my future home, I thought! Certainly it made a brave picture. I had seen similar ones fired-in on many a Heidelberg stein. Backed by towering hills,[…]a sky of palest Gobelin flecked with fat, fleecy little clouds, it in truth looked a dear little city; the city of one's dreams.”

   “Similar studies of rats have employed four different intracranial resorbable, slow sustained release systems—surgical foam, a thermal gel depot, a microcapsule or biodegradable polymer beads.”

2. Having the same shape, in particular, having corresponding angles equal and corresponding line segments proportional.
3. Of two square matrices; being such that a conjugation sends one matrix to the other.

noun

1. That which is similar to, or resembles, something else, as in quality, form, etc.
2. A material that produces an effect that resembles the symptoms of a particular disease.