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.

4 days ago · A companion bill to similar legislation introduced in the Senate, the SEMI Investment Act would extend the Advanced Manufacturing Investment Tax Credit (“Section 48D”) …

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

Nov 10, 2025 · Volume production of the electric big rig hasn't gotten underway just yet, but Tesla has already revised the front end and made it more efficient.

Semi - is a combining form used like a prefix meaning “half.” In some instances, it is used figuratively to mean "partially," "incompletely," or "somewhat."

semi-skilled used to describe something that happens twice within a particular time: a semi-weekly appointment (Definition of semi from the Cambridge Business 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.

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'': …

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Despite what you may think, the "semi" in “semi-truck” actually refers to the trailer, not the truck itself. In fact, the name “semi-truck” is just a shortened version of “semi-trailer truck.”