twelvemonth Meaning, Definition & Usage

  1. noun a period of time containing 365 (or 366) days
    yr; year.
    • she is 4 years old
    • in the year 1920

WordNet


Twelve"month noun
Definitions
  1. A year which consists of twelve calendar months.
    I shall laugh at this a twelvemonth hence. Shak.

Webster 1913