twelvemonth twelvemo • twelvepence · · · Info · Definitions · Synonyms · Characters · · twelvemonth · · Text Latin · · Script 11 · · Length Definitions · · · (noun) a period of time containing 365 (or 366) days. Synonyms: year, yr. Examples: "She is 4 years old." "In the year 1920." · · Noun Definition 1 Synonyms · · · year · · Synonym 1 yr · · Synonym 2 Characters · · e latin small letter e U+0065 h latin small letter h U+0068 l latin small letter l U+006C m latin small letter m U+006D n latin small letter n U+006E o latin small letter o U+006F t latin small letter t U+0074 v latin small letter v U+0076 w latin small letter w U+0077