#twelvemonth__yr  a period of time containing 365 (or 366) days; "she is 4 years old"
  supertype:  time_period__period__period_of_time  an amount of time; "a time period of 30 years"; "hastened the period of his recovery"
  part of:  decade
  subtype:  church_year__Christian_year  the year in the ecclesiastical calendar; especially feast days and special seasons
  subtype:  Holy_Year  (Roman Catholic) a period of remission from sin (usually granted every 25 years)
  subtype:  New_Year  the calendar year just begun
  subtype:  common_year__365_days  a year that is not a leap year
  subtype:  leap_year__intercalary_year__intercalaryyear__366_days__bissextile_year  in the Gregorian calendar: any year divisible by 4 except centenary years not divisible by 400
  subtype:  off_year__offyear  a year in which no major political elections are held
  subtype:  off_year.twelvemonth__offyear  a year in which productivity is low or inferior
  subtype:  calendar_year__calendaryear__civil_year__civilyear  the year (reckoned from January 1 to December 31) according to Gregorian calendar
     subtype:  date  the particular "day/month/year" (usually according to the Gregorian calendar) that an event occurred; "he tried to memorizes all the dates for his history class"
        subtype:  BC__B.C.__before_Christ  date used in reckoning dates before the supposed year Christ was born; "in 200 BC"
        subtype:  AD__A.D.__anno_Domini  in the year of Our Lord; date used in reckoning dates after the supposed year Christ was born, "in AD 200"
        subtype:  date_of_reference__epoch  (astronomy) the precise date that is the point of reference for which information (as coordinates of a celestial body) is referred
  subtype:  fiscal_year__financial_year__financialyear  any accounting period of 12 months
  subtype:  year_of_grace  any year of the Christian era
  subtype:  Y2K  the year 2000 in the Gregorian calendar

No statement uses or specializes twelvemonth; click here to add one.