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Webster 1913 Edition

Noun.

[Cf. F.

mutualité

The quality of correlation; reciprocation; interchange; interaction; interdependence.

(Law)

Reciprocity of consideration.

Wharton.

Noun.

Reciprocation; interchange.

mutuality ‎(countable and uncountable, plural mutualities)

The property of being mutual.
- The mutuality of mutually assured destruction is key to its function as a deterrent.

the property of being mutual