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Webster 1913 Edition

Noun.

[L.

immutabilitas

: cf. F.

immutabilité

The state or quality of being immutable; immutableness.

Heb. vi. 17.

Noun.

[L. immutabilitas; in and mutabilis, mutable, from muto, to change.]

Unchangeableness; the quality that renders change or alteration impossible; invariableness. Immutability is an attribute of God.

immutability ‎(usually uncountable, plural immutabilities)

The state or quality of being immutable

(computing) The state of being unchangeable in the memory after creation

immutability in The Century Dictionary, The Century Co., New York, 1911
immutability in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913