A calendar year with an extra day added in February.

synonyms: 366 days, bissextile year, intercalary year.

Roget 114: chronometry, horometry^†, horology; date, epoch; style, era.    almanac, calendar, ephemeris; register, registry; chronicle, annals, journal, diary.    [Instruments for the measurement of time] chronogram; clock, wall clock, pendulum clock, grandfather's clock, cuckoo clock, alarm clock, clock radio; watch, wristwatch, pocket watch, stopwatch, Swiss watch; atomic clock, digital clock, analog clock, quartz watch, water clock; chronometer, chronoscope^†, chronograph; repeater; timekeeper, timepiece; dial, sundial, gnomon, horologe, pendulum, hourglass, clepsydra^†; ghurry^†.    chronographer^†, chronologer, chronologist, timekeeper; annalist.    calendar year, leap year, Julian calendar, Gregorian calendar, Chinese calendar, Jewish calendar, perpetual calendar, Farmer's almanac, fiscal year.    ... show more

Roget 138: periodicity, intermittence; beat; oscillation etc. 314; pulse, pulsation; rhythm; alternation, alternateness, alternativeness, alternity^†.    bout, round, revolution, rotation, turn, say.    anniversary, jubilee, centenary.    catamenia^†, courses, menses, menstrual flux.    [Regularity of return] rota, cycle, period, stated time, routine; days of the week; Sunday, Monday &c.; months of the year; January &c.; feast, fast &c.; Christmas, Easter, New Year's day &c.; Allhallows^†, Allhallowmas^†, All Saints' Day; All Souls', All Souls' Day; Ash Wednesday, bicentennial, birthday, bissextile^†, Candlemas^†, Dewali, groundhog day [U.S.], Halloween, Hallowmas^†, Lady day, leap year, Midsummer day, Muharram, woodchuck day [U.S.], St.    Swithin's day, natal day; yearbook; yuletide.    punctuality, regularity, steadiness.    ... show more

Dutch: schrikkeljaar
Polish: rok przestępny