Definition of -ion in English:

-ion

suffix

  • 1Forming nouns denoting verbal action.

    ‘communion’
    ‘rebellion’
    1. 1.1Denoting a resulting state or product.
      ‘oblivion’
      ‘opinion’

Usage

The suffix -ion is usually found preceded by s (-sion), t (-tion), or x (-xion)

Origin

Via French from Latin -ion-.

Pronunciation

-ion

/(ə)n/ /ɪən/ /jən/