Breadcrumb Home > Thesaurus > T Synonyms of twelvemonth Find synonyms for: Noun 1. year, twelvemonth, yr, time period, period of time, period usage: a period of time containing 365 (or 366) days; "she is 4 years old"; "in the year 1920" WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of twelvemonth (Dictionary) TrendingHere are the facts and trivia that people are buzzing about. Hanukkah Origins of the Christmas Holiday Jewish Holidays, 2010-2030 (A.M. 5770-5791) Western Christian Holidays, 2010-2030 Krampus: The Christmas Devil Kwanzaa ✖ Related Content Daily Word Quiz: demagogue Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language