twelvemonth

Noun twelvemonth has 1 sense

• twelvemonth(n = noun.time) year, yr - a period of time containing 365 (or 366) days; "she is 4 years old"; "in the year 1920"
is a kind of period, period of time, time period
has particulars: christian year, church year, holy year, new year, 365 days, common year, 366 days, bissextile year, intercalary year, leap year, off year, off year, calendar year, civil year, financial year, fiscal year, annum, year of grace, y2k
is a part of decade, decennary, decennium