immutability

Borrowed from Middle French immutabilité, itself borrowed from Latin immūtābilitās.

immutability (usually uncountable, plural immutabilities)

1. The state or quality of being immutable; immutableness.
2. (computing) The state of being unchangeable in the memory after creation.

• “immutability”, in The Century Dictionary […], New York, N.Y.: The Century Co., 1911, →OCLC.
• “immutability”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.