/ Thesaurus / A Synonyms of a.m. Find synonyms for: Noun1. americium, Am, atomic number 95, metallic element, metalusage: a radioactive transuranic metallic element; discovered by bombarding uranium with helium atoms2. Master of Arts, MA, Artium Magister, AM, master's degreeusage: a master's degree in arts and sciences3. amplitude modulation, AM, modulationusage: modulation of the amplitude of the (radio) carrier waveAdjective1. ante meridiem, a.m., antemeridian (vs. postmeridian)usage: before noonAdverb1. ante meridiem, A.M.usage: before noon; "let's meet at 11 A.M."WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: reticent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language