Real Dictionary

season
countable noun: The seasons are the main periods into which a year can be divided and which each have their own typical weather conditions.

season in American English
any of the four arbitrary divisions of the year, characterized chiefly by differences in temperature, precipitation, amount of daylight, and plant growth; spring, summer, fall (or autumn), or winter
noun: one of the four periods of the year (spring, summer, autumn, and winter), beginning astronomically at an equinox or solstice, but geographically at different dates in different climates

season in British English
noun: 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, au

season in Retail
noun: In retailing, a season is a distinct time of the year when certain types of goods are available or in vogue.