#1 semi n. [semifinal] one of the two competitions in the next to the last round of an elimination tournament. wn
#2 semi n. [trailer truck, tractor trailer, trucking rig, rig, articulated lorry] a truck consisting of a tractor and trailer together. wn
#3 semi n. [semitrailer] a trailer having wheels only in the rear; the front is supported by the towing vehicle. wn
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