semicentennial
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sem·i·cen·ten·ni·al
(sĕm′ē-sĕn-tĕn′ē-əl, sĕm′ī-)adj.
Marking the 50th anniversary of an event.
n.
A 50th anniversary or its celebration.
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.
semicentennial
(ˌsɛmɪsɛnˈtɛnɪəl)adj
1. (prenominal) of or relating to the 50th anniversary of some event
2. occurring once every 50 years
n
a 50th anniversary
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
sem•i•cen•ten•ni•al
(ˌsɛm i sɛnˈtɛn i əl, ˌsɛm aɪ-)adj.
1. of or pertaining to a fiftieth anniversary.
n. 2. a fiftieth anniversary.
3. a celebration of this.
[1855–60]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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Noun 1. semicentennial - the 50th anniversary (or the celebration of it)
anniversary, day of remembrance - the date on which an event occurred in some previous year (or the celebration of it)
Adj. 1. semicentennial - of or relating to or marking the 50th anniversary
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