what does semi mean?
Dictionary entry overview: What does semi mean? â¢ SEMI (noun) The noun SEMI has 3 senses: 1. one of the two competitions in the next to the last round of an elimination tournament 2. a truck consisting of a tractor and trailer together 3. a trailer having wheels only in the rear; the front is supported by the towing vehicle Familiarity information: SEMI used as a noun is uncommon.