/ Dictionary / Index L Lamarckism: Meaning and Definition of Find definitions for: La•marck•ism Pronunciation: (lu-mär'kiz-um), [key] — n. the Lamarckian theory that characteristics acquired by habit, use, or disuse may be passed on to future generations through inheritance. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: lamarckism (Thesaurus) Lamarckian La Marque Related Content Daily Word Quiz: arid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language