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Adjective: intercalary  in'tur-ku,le-ree or ,in-tur'ka-lu-ree or [N. Amer], ,in-tu'ka-lu-ree or in'tur-ku-lu-ree [Brit]
  1. Having a day or month inserted to make the calendar year correspond to the solar year
    "Feb. 29 is an intercalary day"; "a leap year is an intercalary year"

See also: additive

Encyclopedia: Intercalary