An informal competition among birdwatchers to determine who can see or hear the largest number of species of birds within a single calendar year and within a specific geographical area.

The holiday commemorating (the beginning of) the new year.

A year that does not contain the day February 29.

(astronomy) Great Year; one complete precession of the equinoxes, approximately 25,765 years.

Synonym of twilight years

In the Jewish calendar, a year of 355 days or a leap year of 385 days; perfect year.

plural of abundant year

The period of time equal to half a year; normally referred to as 6 months, but a half-year is more exactly 182.5 days (without a leap day)

A yellow azo dye, 4-phenyldiazenylaniline

(idiomatic, mildly euphemistic) Old; advanced in age.