SEMI- definition: a combining form borrowed from Latin, meaning “half,” freely prefixed to English words of any origin, now sometimes with the senses “partially,” “incompletely,” “somewhat”. See …

The meaning of SEMI is semifinal —often used in plural. How to use semi in a sentence.

Semi- is a numerical prefix meaning "half". The prefix alone is often used as an abbreviation when the rest of the word (the thing which half of is being described) is clear from context.

Dec 29, 2025 · Adverb [edit] semi (not comparable) (informal) Somewhat; to some extent. quotations

semi- a combining form meaning “half” (semiannual), “partially,” “somewhat” (semiautomatic; semidetached; semiformal).

semi-, prefix meanings, etymology, pronunciation and more in the Oxford English Dictionary

A semi is a large truck that is made in two separate sections, a tractor and a trailer, which are joined together by metal bars.