Definition of "immutability" [im•mu•ta•bil•i•ty]

• The state or quality of being immutable; immutableness. (noun)
• The state of being unchangeable in the memory after creation. (noun)

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• "When using the word immutability in the context of Clojure, we'll more often than not refer strictly to its core data types."
• "With many in our leadership, this alleged "immutability" of ours is now a dogma."
• "When the gay-rights movement came along in 1969, we felt compelled to jump on that "immutability" bandwagon."