sem ‧ i /ˈsemi/ BrE AmE noun ( plural semis ) [countable]
[ Sense 1: Date: 1900-2000 ; Origin: semi-detached ]
[ Sense 2: Date: 1900-2000 ; Origin: semi-final ]
[ Sense 3: Date: 1900-2000 ; Origin: semi-trailer ]
1 . British English informal a ↑ semi-detached house:
a three-bedroomed semi
2 . informal a ↑ semi-final
3 . American English a very large heavy truck consisting of two connected parts, which carries goods over long distances SYN articulated lorry British English