(mathematics) At a constant ratio (to). Two magnitudes (numbers) are said to be proportional if the second varies in a direct relation arithmetically to the first. Symbol: ∝.

(mathematics) A decimal representation of a real number that, at some point, becomes periodic (and repeats some sequence of digits infinitely)

plural of door-mat (alternative form of doormats).

(archaic, intransitive) To wander about with no fixed purpose.