verb To assess the similarities and differences between two or more things ["to compare X with Y"]. Having made the comparison of X with Y, one might have found it similar to Y or different from Y.
Compare the tiger's coloration with that of the zebra.
verb To declare two things to be similar in some respect ["to compare X to Y"].
Astronomers have compared comets to dirty snowballs.
verb To form the three degrees of comparison of (an adjective).
We compare "good" as "good", "better", "best".
verb To be similar (often used in the negative).
A sapling and a fully-grown oak tree do not compare.
verb To get; to obtain.
noun Comparison.
noun An instruction or command that compares two values or states.