Longman Dictionary of Contemporary English homepage

Language: Latin
Origin:

semi-

 prefix
     
semi-
1XX exactly half:
a semicircle
2 partly but not completely:
in the semi-darkness
semi-literate people
3XX happening, appearing etc twice in a particular period:
a semi-weekly visit
a semi-annual publication
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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