- the quality of being liable to undergo change or alteration:With the realization of cancer's mutability, they now fear it might not be the same disease in everyone.
- the quality of constantly changing; transient or transitory quality:National borders can have a permanence that contrasts with the almost infinite mutability of the cultures contained within them.
- (in object-oriented programming) the characteristic of an object having properties whose values can change while the object itself maintains a unique identity: The mutability of the "sales report" object allows properties like sales period and salesperson to be updated without losing the reference to the report elsewhere in the application.
