seasonal
sea-son-al / sē-zə-nəl
adjective 1. pertaining to or occurring during a particular period, or season, of a year However long the dry season takes, a seasonal river will never forget where it used to pass. African Proverb etymology Ultimately from the Latin Feminine noun satio, sationis (sowing, planting), derived from the same root as the Latin verb sero serere, sevi, satum (sow, plant), through the Old French noun seson/ seison/ saison (sowing time) and the Middle English noun sesoun/ seson of the same meaning, combined with the suffix -al, from the Latin suffix -alis (pertaining to). Thank you to Allen Ward for providing this etymology.