Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.

WORD ORIGIN

late 14c., "due relation of one part to another," also "size, extent; compartative relation in size, degree, number, etc.," from Old French proporcion "measure, proportion" (13c.), from Latin proportionem (nominative proportio) "comparative relation, analogy," from phrase pro portione "according to the relation" (of parts to each other), from pro "for" (see pro-) + ablative of *partio "division," related to pars (see part (n.)). Phrase out of proportion attested by 1670s.

Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.