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Force

From Wictionary:

Verb

to force (third-person singular simple present forcespresent participle forcingsimple past and past participle forced)

  1. (transitive) To exert violencecompulsion, or constraint upon or against a person or thing.

This is not a good definition because it confuses purely mechanical force (i.e. against a thing) with coercion.

The correct definition in the context of the Zero Aggression Principle is simply:

To exert violencecompulsion, or constraint.