Breadcrumb Home > Dictionary > Index L Cite Lamarckian: Meaning and Definition of Find definitions for: La•marck•i•an Pronunciation: (lu-mär'kē-un), [key] — adj. of or pertaining to Jean de Lamarck or his theory of organic evolution. —n. a person who holds this theory. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: lamarckian (Thesaurus) Lamarck Lamarckism TrendingHere are the facts and trivia that people are buzzing about. January 2021 Current Events: US News The Holocaust (1933–1945) Chinese New Year History, Meaning, and Celebrations Noble Titles and Ranks in a Monarchy The 5 Best Air Purifiers of 2020 Inaugural Trivia Related Content Daily Word Quiz: obviate Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language