quinquagenary

quin•qua•gen•a•ry

(ˌkwɪŋ kwəˈdʒɛn ə ri, ˌkwɪn-)
n.
a 50th anniversary.
[1580–90; <quinquagenarius <quinquagen(i) fifty each]
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References in periodicals archive ?
The Kinks haven't played together since the mid-1990s, but when asked exactly where he'll celebrate the Kinks' 2014 quinquagenary, Davies gives a most Kinksian reply.
Sound, Sign, and Meaning: Quinquagenary of the Prague Linguistic Circle.
"Narrative Worlds." Sound, Sign, and Meaning: Quinquagenary of the Prague Linguistic Circle.