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'Semi-' is a Latin prefix to a verb, noun, or adjective meaning "half". Some compounds formed with it are often abbreviated to simply "semi" in appropriate contexts:

★ A semi-automatic firearm

★ A semi-trailer truck (UK: articulated lorry)

★ The watercraft: Semi-submersible

★ The time interval in music ''(UK)'': Semiquaver, which is half the length of a quaver.

★ The housing type ''(UK)'': Semi-detached house.

★ In financial news, 'semi' or 'semis' are often used to refer to the semiconductor industry or the corporations therein.

★ A semi formal (esp. high school) dance.

★ A semi-final of a knockout competition.
''See also SEMI.''
''Semi is the Japanese word for cicada''