sesquicentennial
UK /ˌsɛskwɪsɛnˈtɛni.əl/ US /ˌsɛskwɪsɛnˈtɛni.əl/
adj 2noun 1
Definitions
adj
1
Occurring every 150 years.
2
Of, or relating to a sesquicentenary.
noun
1
A 150th anniversary.
The city celebrated its sesquicentennial last year.
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