twelvemonth

noun
twelve·​month | \ˈtwelv-ˌmən(t)th \

Definition of twelvemonth 

: year

First Known Use of twelvemonth

12th century, in the meaning defined above

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The first known use of twelvemonth was in the 12th century

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twelvemonth

noun
twelve·​month | \ˈtwelv-ˌmənth \

Kids Definition of twelvemonth

: year

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