/ Dictionary / Index A achromaticity: Meaning and Definition of Find definitions for: ach•ro•ma•tic•i•ty Pronunciation: (ak"rō-mu-tis'i-tē, ā"krō-), [key] — n. Optics. achromatism. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: achromaticity (Thesaurus) achromatic achromatic lens Related Content Daily Word Quiz: jaundice Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language