a year determined by a certain number of phases of the moon, as opposed to the passage of the Earth around the sun

(informal) A period of time in the life of dogs, defined such that the average life expectancy of a dog in "dog years" is numerically equivalent to the average life expectancy of a human. A 4- and a 5-year-old dog are about as mature as a human of 28 to 30 years and 33 to 35 years, respectively. The most common calcuation uses a ratio of seven dog years to one human year.

(Britain, Ireland, Australia, idiomatic) A long time, years and years.

On or happening at the end of the year (e.g., late December).

The orbital period of the Earth; a measure of the time it takes for the Sun to return to the same position with respect to the stars of the celestial sphere. A sidereal year is about 20.4 minutes longer than the tropical year (which is what is kept stable by the Gregorian calendar) due to precession of the equinoxes.

plural of common year

plural of dog year

One person's working time for a year, or the equivalent, used as a measure of how much work or labor is required or consumed to perform some task.

plural of solar year

The time it takes the Earth to pass once around the Sun, as reckoned with respect to the seasons and not the fixed stars (for instance from vernal equinox to vernal equinox).