semicentennial
se·mi·cen·tennial
adjective
1.
of or relating to or marking the 50th anniversary
noun
1.
the 50th anniversary (or the celebration of it)
Origin
From semi- (“half”) + centennial (“100 year, 100th anniversary”), q.v.
Related words
Broader terms
WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.