1887, "special group-study class for advanced students," from German Seminar "group of students working with a professor," from Latin seminarium "breeding ground, plant nursery" (see seminary). Sense of "meeting for discussion of a subject" first recorded 1944.
semi-demi-
semi-detached
semifinal
semi-monthly
seminal
seminar
seminarian
seminary
semination
Seminole
semi-official