1.NounThe middle part of a season, such as a sporting, television, or growing season.
"Tourism has a high season (summer), a midseason (spring and fall), and a low season (winter).; The amount of water needed is about 50% of the water used in the midseason.; Underperforming TV programs are often replaced in the midseason of the schedule."
2.AdjectiveOccurring in the midseason.
"This apple is a midseason variety grown best in northern climates.; The midseason finale had a great cliffhanger."