Wordnet 3.0
NOUN (3)
1. one of the two competitions in the next to the last round of an elimination tournament;
[syn: semifinal, semi]
2. a truck consisting of a tractor and trailer together;
[syn: trailer truck, tractor trailer, trucking rig, rig, articulated lorry, semi]
3. a trailer having wheels only in the rear; the front is supported by the towing vehicle;
[syn: semitrailer, semi]
The Collaborative International Dictionary of English v.0.48:
Semi- \Sem"i-\ [L. semi; akin to Gr. ???, Skr. s[=a]mi-, AS. s[=a]m-, and prob. to E. same, from the division into two parts of the same size. Cf. Hemi-, Sandelend.] A prefix signifying half, and sometimes partly or imperfectly; as, semiannual, half yearly; semitransparent, imperfectly transparent. [1913 Webster] Note: The prefix semi is joined to another word either with the hyphen or without it. In this book the hyphen is omitted except before a capital letter; as, semiacid, semiaquatic, semi-Arian, semiaxis, semicalcareous. [1913 Webster]Jargon File (4.4.4, 14 Aug 2003):
semi /se'mee/, /se'mi:/ 1. n. Abbreviation for `semicolon', when speaking. "Commands to grind are prefixed by semi-semi-star" means that the prefix is ;;*, not 1/4 of a star. 2. A prefix used with words such as `immediately' as a qualifier. "When is the system coming up?" "Semi-immediately." (That is, maybe not for an hour.) "We did consider that possibility semi-seriously." See also infinite.

