-io

an action, process, or result

Forms

-io
-ion- — The longer form used before Latin endings.
-ion — The form carried into many English nouns.

Origin

An old Latin noun ending, inherited from earlier Indo-European word formation.

Note

The ending can name both an activity and what that activity produces.

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noun

intervention

in-ter-VEN-shun/ˌɪntərˈvenʃn/

Action taken to change a situation by becoming involved in it.

His intervention separates the two men before their argument becomes a fight.

An older man steps between two young men in an escalating confrontation, visibly blocking their advance with open hands.

Etymology

interLatinbetween, among

+ventLatincome

+ionLatinan action, process, or result

An intervention is literally a “coming between.” That image extends from interposing oneself or interceding for someone to taking action that interrupts or changes a situation.

In context

TED3:27

Let us turn to Afghanistan. 10 years after that military intervention, that country is far from secure.

Jonas Gahr Støre: In defense of dialogue

More examples

The early intervention helped the child catch up at school.
They requested government intervention in the dispute.
The mediator's intervention brought both sides back to the table.

Forms

intervention · interventions

intervene verb — become involved to affect a situation

Similar words

involvement: Does not necessarily imply an action intended to change events.
interference: Usually suggests unwelcome involvement rather than neutral or helpful action.