twelve·month /-ˌmʌn(t)θ/
  十二個月;一年
  Twelve·month n. A year which consists of twelve calendar months.
     I shall laugh at this a twelvemonth hence.   --Shak.
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  twelvemonth
       n : a period of time containing 365 (or 366) days; "she is 4
           years old"; "in the year 1920" [syn: year, yr]