English dictionary twelvemonth meaning and definition Definition and meaning of twelvemonth at MeaningMonkey.org. twelvemonth meaning and definition in the English Dictionary. TWELVEMONTH nounDefinition of twelvemonth (noun)a period of time containing 365 (or 366) days"she is 4 years old"; "in the year 1920"synonyms: year, yr Source: Princeton University Wordnet
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