'semi' definitions:

Definition of 'semi'

From: WordNet
noun
One of the two competitions in the next to the last round of an elimination tournament [syn: semifinal, semi]
noun
A truck consisting of a tractor and trailer together [syn: trailer truck, tractor trailer, trucking rig, rig, articulated lorry, semi]
noun
A trailer having wheels only in the rear; the front is supported by the towing vehicle [syn: semitrailer, semi]