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1. Occurring or continuing after one's death: a posthumous award.
2. Published after the writer's death: a posthumous book.
3. Born after the death of the father: a posthumous child.
[Middle English posthumus, from Late Latin, alteration (perhaps influenced by Latin humus, earth or humāre, to bury) of postumus, superlative of posterus, coming after; see posterior.]
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.
the fact of being posthumous
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014