semi

(noun) one of the two competitions in the next to the last round of an elimination tournament. Synonyms: semifinal.

(noun) a truck consisting of a tractor and trailer together. Synonyms: trailer truck, tractor trailer, trucking rig, rig, articulated lorry.

(noun) a trailer having wheels only in the rear; the front is supported by the towing vehicle. Synonyms: semitrailer.