Comparison.
An instruction or command that compares two values.
Illustration by comparison; simile.
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.
To declare two things to be similar in some respect ["to compare X to Y"].
Astronomers have compared comets to dirty snowballs.
(grammar) To form the three degrees of comparison of (an adjective).
We compare "good" as "good", "better", "best".
To be similar (often used in the negative).
A sapling and a fully-grown oak tree do not compare.
To get; to obtain.