Definition of -ion in English:

-ion

Pronunciation: /(ə)n, ɪən, jən/

suffix

  • 1Forming nouns denoting the action of a verb or an instance of this: communion rebellion
  • 1.1Denoting a resulting state or product: oblivion opinion

Origin

via French from Latin -ion-.

Usage

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

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a powerful whirlpool in the sea