In a right triangle, the ratio of the length of the side opposite an acute angle to the length of the hypotenuse.
from The American Heritage Dictionary of the English Language, 4th Edition
The ordinate of the endpoint of an arc of a unit circle centered at the origin of a Cartesian coordinate system, the arc being of length x and measured counterclockwise from the point (1, 0) if x is positive or clockwise if x is negative.
from The American Heritage Dictionary of the English Language, 4th Edition
The trigonometric function that for an acute angle is the ratio between the leg opposite the angle when it is considered part of a right triangle and the hypotenuse.
from Free Scrabble Dictionary
A trigonometric function sin θ that for all real numbers θ is exactly equal to the sine of an angle of measure θ in radians and that is given by the sum of the alternating series.
from Free Scrabble Dictionary
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