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Define the word invariant

"Invariant" gcide "The Collaborative International Dictionary of English v.0.48"

Invariant \In*va"ri*ant\, n. (Math.)
   An invariable quantity; specifically, a function of the
   coefficients of one or more forms, which remains unaltered,
   when these undergo suitable linear transformations. --J. J.
   Sylvester.
   [1913 Webster]

"invariant" wn "WordNet (r) 2.0"

invariant
     adj 1: unaffected by a designated operation or transformation
     2: persistent in occurrence and unvarying in nature;
        "maintained a constant temperature"; "a constant beat";
        "principles of unvarying validity"; "a steady breeze"
        [syn: changeless, constant, steady, unvarying]

"invariant" foldoc "The Free On-line Dictionary of Computing (27 SEP 03)"

invariant
     
         A rule, such as the ordering of an ordered
        list or heap, that applies throughout the life of a data
        structure or procedure.  Each change to the data structure
        must maintain the correctness of the invariant.
     
        (1996-03-12)