Meaning of “semi” in the English Dictionary

"semi" in British English

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seminoun [ C ]

uk /ˈsem.i/ us /ˈsem.aɪ/ plural semis informal

semi-prefix

uk /sem.i-/ us /sem.aɪ-/ /sem.i-/

(Definition of “semi” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"semi" in American English

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seminoun [ C ]

us /ˈsem·i, -ɑɪ/ plural semis

semi noun [ C ] (TRUCK)

infml also semitrailer a large truck with a separate trailer (= vehicle without an engine) for carrying freight, or such a trailer itself:

The semi screeched to a halt.

semi noun [ C ] (COMPETITION)

short form ofsemifinal

semi-prefix

us /ˌsem·i, -ɑɪ/

half or partly:

semiretired
semiserious

(Definition of “semi” from the Cambridge Academic Content Dictionary © Cambridge University Press)

"semi-" in Business English

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semi-prefix

uk /semi-/ us

half or partly:

Hugh is a semi-retired manufacturer of machine tools.
semi-permanent

used to describe something that happens twice within a particular time:

a semi-weekly appointment

(Definition of “semi-” from the Cambridge Business English Dictionary © Cambridge University Press)