1. Pertaining to, resulting from, or characterised by association; capable of associating; tending to associate or unite.
  2. such that, for any operands <math> a, b, c </math>, <math> (a * b) * c = a * (b * c) </math>
  3. addressable by a key more complex than an integer index
    Awk's associative arrays may be indexed by strings.
    Associative memories were once given considerable attention.

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