postseasonal adjective2 •After a season (such as a holiday season, hunting season, flu season, etc.)Atmospheric mold sensitivity may prolong postseasonal ragweed symptoms until frost. — 1975 •Outdated; based on the culture of an earlier time."One is all the more delighted," he writes in a note, "to revel in these postseasonal rarities which have the flavor of a second coming, and a mystery." — 2001