also: さっき
noun
last season; equivalent season last year
Used primarily in sports contexts to refer to the previous season or the same season of the previous year.
昨季の優勝チームは今年も強い。
Last season's championship team is strong again this year.
彼は昨季、ホームラン王を獲得した。
He won the home run title last season.
Compound of 昨 (saku, 'last, previous') and 季 (ki, 'season'). The reading さっき is a euphonic change from さくき.