Definition of semi- in English:

semi-

prefix

1Half: semicircular
1.1Occurring or appearing twice in a specified period: semi-annual
2Partly; in some degree or particular: semi-conscious
2.1Almost: semi-darkness

Origin

from Latin; related to Greek hēmi-.

Definition of semi- in:

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Word of the day humoresque
Pronunciation: ˌ(h)yo͞oməˈresk
noun
a short, lively piece of music