The prefix semi is commonly used in the English language to indicate partiality or incompleteness. It is derived from the Latin word “semi,” which means half. The addition of semi to a word can …

semi-, Pronouns a combining form borrowed from Latin, meaning "half,'' freely prefixed to English words of any origin, now sometimes with the senses "partially,'' "incompletely,'' "somewhat'': …

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”. …

Semi- is usually used to mean partially or half when talking about technical or scientific subjects, as well as math. When coining a word meaning half of something, English speakers will most …

(Definition of semi- from the Cambridge Learner's Dictionary © Cambridge University Press)

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

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

2 ENTRIES FOUND: semi (noun) semi- (prefix) semi- prefix Britannica Dictionary definition of SEMI- 1 : half

A: "Semi" means "half" and is derived from the Latin root semis. It is commonly used as a prefix in English to indicate something that is partial, incomplete, or split into two parts, such as …

Dec 26, 2025 · Etymology Borrowed from Latin semi- (“half”), from Proto-Indo-European *sēmi / *sēmi-. Cognate to English sam, and to hemi- (via Ancient Greek).