Mal·colm X (m?l?k?m ?ks?) Originally Malcolm Little. 1925-1965. American activist. A member of the Nation of Islam (1952-1963), he advocated separatism and black pride. After converting to orthodox Islam, he founded the Organization of Afro-American Unity (1964) and was assassinated in Harlem.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.Malcolm X (?ks) n (Biography) original name Malcolm Little. 1925?65, US Black civil-rights leader: assassinatedCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014Mal?colm X (?mæl k?m ??ks) n. (Malcolm Little), 1925?65, U.S. civil-rights activist and religious leader. Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.