twelvemonth

twelve·month  (twlvmnth)

n.

A year.

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twelvemonth

Noun

Archaic, chiefly Brit a year

Thesaurus

Noun

1.

twelvemonth - a period of time containing 365 (or 366) days; "she is 4 years old"; "in the year 1920" year, yr period, period of time, time period - an amount of time; "a time period of 30 years"; "hastened the period of time of his recovery"; "Picasso's blue period" Christian year, church year - the year in the ecclesiastical calendar; especially feast days and special seasons Holy Year - (Roman Catholic Church) a period of remission from sin (usually granted every 25 years) New Year - the calendar year just begun 365 days, common year - a year that is not a leap year 366 days, bissextile year, intercalary year, leap year - in the Gregorian calendar: any year divisible by 4 except centenary years divisible by 400 off year - a year in which no major political elections are held off year - a year in which productivity is low or inferior calendar year, civil year - the year (reckoned from January 1 to December 31) according to Gregorian calendar financial year, fiscal year - any accounting period of 12 months annum - (Latin) year; "per annum" decade, decennary, decennium - a period of 10 years year of grace - any year of the Christian era Y2K - the year 2000 in the Gregorian calendar