trimonthly

adjective
tri·​month·​ly | \ (ˌ)trī-ˈmən(t)th-lē How to pronounce trimonthly (audio) \

Definition of trimonthly

: occurring every three months

First Known Use of trimonthly

1856, in the meaning defined above

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The first known use of trimonthly was in 1856

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