Source : WordNet®

Fibonacci sequence
     n : a sequence of numbers in which each number equals the sum of
         the two [receding numbers

Source : Free On-Line Dictionary of Computing

Fibonacci sequence
     
         The {infinite} sequence of numbers beginning
     
        	1, 1, 2, 3, 5, 8, 13, ...
     
        in which each term is the sum of the two terms preceding it.
     
        The ratio of successive Fibonacci terms tends to the {golden
        ratio}, namely (1 + sqrt 5)/2.
     
        [Why not "Fibonacci {series}"?]
     
        (2002-10-15)