1. one of the four equal periods into which the year is divided by the equinoxes and solstices, resulting from the apparent movement of the sun north and south of the equator during the course of the earth's orbit around it. These periods (spring, summer, autumn, and winter) have their characteristic weather conditions in different regions, and occur at opposite times of the year in the N and S hemispheres
2. a period of the year characterized by particular conditions or activities
3. the period during which any particular species of animal, bird, or fish is legally permitted to be caught or killed
4. any of the major periods into which the ecclesiastical calendar is divided, such as Lent, Advent, or Easter
5. in season
a. (of game) permitted to be caught or killed
b. (of some female mammals) sexually receptive
(1) One of the four parts into which the year is divided—spring, summer, autumn, or winter.
(2) A part of the year characterized by a particular natural phenomenon, such as the rainy season, or customarily associated with a particular kind of work, such as the harvest season, or with a particular pastime or activity, such as the hunting season or health-resort season.
(3) The period during which theaters, concert halls, and other cultural facilities present their regular program of performances.