What is the meaning of -ion?

An action or process, or the result of an action or process.

A state or condition.

A anthropometric reference point.

Especially craniometric points

Together with apo- and peri-, forms names of specific apoapsides and periapsides.

-ion

-ion

Alternative form of -ien (-ian)

Alternative form of -ioun

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Pluralisation suffix

Noun suffix

Source: wiktionary.org