season (n.)

c. 1300, "a period of the year," with reference to weather or work, also "proper time, suitable occasion," from Old French seison, also saison "season, date; right moment, appropriate time" (Modern French saison) "a sowing, planting," from Latin sationem (nominative satio) "a sowing, planting," noun of action from past participle stem of serere "to sow" (from PIE root *sē- "to sow").

Sense shifted in Vulgar Latin from "act of sowing" to "time of sowing," especially "spring, regarded as the chief sowing season." In Old Provençal and Old French (and thus in English), this was extended to "season" in general. In other Indo-European languages, generic "season" (of the year) words typically are from words for "time," sometimes with a word for "year" (as in Latin tempus (anni), German Jahreszeit). Of game (as in out of season) from late 14c. Spanish estacion, Italian stagione are unrelated, being from Latin statio "station."

Meaning "time of year during which a place is most frequented" is from 1705. Season ticket is attested from 1820.

season (v.)

"improve the flavor of by adding spices," c. 1300, from Old French assaisoner "to ripen, season," from a- "to" (see ad-) + root of season (n.) on the notion of fruit becoming more palatable as it ripens. Applied to timber by 1540s. In 16c., it also meant "to copulate with."

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Definitions of season from WordNet
season (v.)
lend flavor to;
Synonyms: flavor / flavour
season (v.)
make fit;
This trip will season even the hardiest traveller
Synonyms: harden
season (v.)
make more temperate, acceptable, or suitable by adding something else;
Synonyms: temper / mollify / moderate
season (n.)
a period of the year marked by special events or activities in some field;
he celebrated his 10th season with the ballet company
she always looked forward to the avocado season
season (n.)
one of the natural periods into which the year is divided by the equinoxes and solstices or atmospheric conditions;
the regular sequence of the seasons
Synonyms: time of year
season (n.)
a recurrent time marked by major holidays;
it was the Christmas season