semi

From Wiktionary
See also semi-
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Pronunciation[change]

Noun[change]

Singular
semi

Plural
semis

Red freightliner
  1. A semi is a kind of trailer that has no front wheels. Also, a truck pulling this kind of trailer.
  2. (slang) A semi is a semi-final.
  3. (slang) A semi is a semi-detached house.
  4. (vulgar) (slang) A semi is a partial erection.