A prefix is placed at the beginning of a word to modify or change its meaning. Here are 7 common prefixes in English, together with their basic meaning and some examples.

  1. counter-
    meaning: opposition, opposite direction
    example: counter-attack, counteract
  2. extra-
    meaning: outside, beyond
    example: extracurricular, extramarital
  3. hemi-
    meaning: half
    example: hemisphere
  4. inter-
    meaning: between, among
    example: interact, interchange
  5. non-
    meaning: absence, negation
    example: non-smoker, non-alcoholic
  6. post-
    meaning: after in time or order
    example: postpone
  7. re-
    meaning: again
    example: repaint, reappraise, reawaken

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