An annual holiday of several cultures that marks the beginning of a new year according to a lunar or lunisolar calendar, as opposed to a new year dictated by a solar calendar such as the Julian or Gregorian calendars.

Alternative form of year-round.

plural of New Year's Eve

A project that is culmination of an academic course or major. This is typically done at the end of said course or major.

(medicine) A unit of measurement, equivalent to one year of life in perfect health, that can be used to decide whether a medical procedure is worthwhile for an individual.

A storm of such force that it occurs only once every one hundred years approximately.

plural of one-hundred-year storm

I was born ... year(s) ago.

A century egg (Chinese egg dish)

plural of thousand-year-old egg