Immutability
The Century Dictionary and Cyclopedia
noun.
The quality of being immutable; immutableness; unchangeableness; invariableness.
the GNU version of the Collaborative International Dictionary of English
noun.
The state or quality of being immutable; immutableness.
Wiktionary, Creative Commons Attribution/Share-Alike License
noun.
The state or quality of being
immutable
;
immutableness
.
noun.
The state of being unchangeable in the memory after creation.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
noun.
the quality of being incapable of mutation
Word Usage
"When using the word immutability in the context of Clojure, we'll more often than not refer strictly to its core data types."