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 examples …

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.

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

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

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

semi noun [C] (VEHICLE) US (UK articulated lorry) a large truck for carrying goods, consisting of a strong front part that pulls a large box-like container behind it

SEMI is a global industry association that connects and supports companies in the microelectronics design and manufacturing value chain.

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

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.

Definition of semi noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.