13 letters · 17 points in Scrabble
adjective being in due proportion
adjective agreeing in amount, magnitude, or degree
adjective exhibiting equivalence or correspondence among constituents of an entity or between different entities
originBorrowed from Latin prōportiōnātus, see -ate (adjective-forming suffix) and -ate (verb-forming suffix). By surface analysis, proportion + -ate.
Etymology from Wiktionary, CC BY-SA 3.0