Definition of semi- in English:

semi-

Syllabification: semi-
Pronunciation: /ˈsemē
 
/

prefix

1Half: semicircular
1.1Occurring or appearing twice in a specified period: semiannual
2Partly; in some degree or particular: semiconscious
2.1Almost: semidarkness

Origin

from Latin; related to Greek hēmi-.

Definition of semi- in:

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Word of the day neoteny
Pronunciation: niːˈɒt(ə)ni
noun
retention of juvenile features in the adult animal