Noun twelvemonth has 1 sense
  1. year, twelvemonth, yr - a period of time containing 365 (or 366) days; "she is 4 years old"; "in the year 1920"
    --1 is a kind of time period, period of time, period
    --1 is a part of decade, decennary, decennium
    --1 has particulars:
     church year, Christian year; Holy Year; New Year; common year, 365 days; leap year, intercalary year, 366 days, bissextile year; off year; off year; calendar year, civil year; fiscal year, financial year; annum; year of grace; Y2K
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