immutability

from WordNet (r) 3.0 (2006)

immutability
    n 1: the quality of being incapable of mutation; "Darwin
         challenged the fixity of species" [syn: {immutability},
         {immutableness}, {fixity}] [ant: {mutability},
         {mutableness}]

from The Collaborative International Dictionary of English v.0.48

Immutability \Im*mu`ta*bil"i*ty\, n. [L. immutabilitas: cf. F.
   immutabilit['e].]
   The state or quality of being immutable; immutableness.
   --Heb. vi. 17.
   [1913 Webster]

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