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noun, Informal.
semitrailer (def 1).
Often, semis. semifinal (def 3).
a combining form borrowed from Latin, meaning “half,” freely prefixed to English words of any origin, now sometimes with the senses “partially,” “incompletely,” “somewhat”:
semiautomatic; semidetached; semimonthly; semisophisticated.
noun (pl) semis
(Brit) a semidetached house
short for semifinal
(US & Canadian, Austral & NZ) short for semitrailer
half: semicircle Compare demi- (sense 1), hemi-
partially, partly, not completely, or almost: semiprofessional, semifinal
occurring twice in a specified period of time: semiannual, semiweekly

semi- pref.

Half: semicanal.

Partial; partially: semiconscious.

Resembling or having some of the characteristics of: semilunar.

A prefix that means “half,” (as in semicircle, half a circle) or “partly, somewhat, less than fully,” (as in semiconscious, partly conscious).

/se’mee/ or /se’mi:/ A spoken abbreviation for semicolon.
“Commands to grind are prefixed by semi semi star” means that the prefix is “;;*”, not 1/4 of a star.
[Jargon File]
subendocardial myocardial infarction


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