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sixmo

noun
six·​mo | \ ˈsiks-(ˌ)mō How to pronounce sixmo (audio) \
plural sixmos

Definition of sixmo

: the size of a piece of paper cut six from a sheet also : a book, a page, or paper of this size

First Known Use of sixmo

1924, in the meaning defined above

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The first known use of sixmo was in 1924

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