Definition of semi- in English:

semi-

prefix

  • 1Half.

    ‘semicircular’
    incomplete, partial, half, semi-, demi-, near, moderate, limited, slight, inadequate, insufficient, unfinished
    View synonyms
    1. 1.1 Occurring or appearing twice in a specified period.
      ‘semi-annual’
  • 2Partly; in some degree or particular.

    ‘semi-conscious’
    1. 2.1 Almost.
      ‘semi-darkness’

Origin

From Latin; related to Greek hēmi-.

Pronunciation

semi-

/ˈsɛmi/