1. [N. Amer, informal] A truck consisting of a tractor and trailer together
   "The semi delivered goods across the country";
   - trailer truck, tractor trailer, trucking rig, rig [N. Amer], articulated lorry [Brit]
    
2. [N. Amer, informal] A trailer having wheels only in the rear; the front is supported by the towing vehicle
   "The truck driver carefully backed the semi into the loading dock";
   - semitrailer [N. Amer], trailer
    
3. [Brit, informal] A house that is attached to another house on only one side
   "They lived in a semi-detached house in a quiet suburban neighbourhood";
   - semi-detached house
    
4. One of the two competitions in the next to the last round of an elimination tournament
   "The team was eliminated in the semi match";
   - semifinal, semi-final

1. Partly, to some degree, partly similar
   "semi-homemade"; "semi-intelligent thoughts";
   - quasi-
    
2. Half

Derived forms: semis

Type of: abode, domicil [rare], domicile, dwelling, dwelling house, habitation, home, lorry [Brit], match, motortruck [N. Amer], trailer, truck

Part of: elimination tournament

Encyclopedia: Semi