/ Dictionary / Index A achromatism: Meaning and Definition of Find definitions for: a•chro•ma•tism Pronunciation: (ā-krō'mu-tiz"um), [key] — n. Optics. freedom from color. freedom from chromatic aberration, as in an achromatic lens. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: achromatism (Thesaurus) achromatic prism achromatize Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language