Fibonacci sequence n 1: a sequence of numbers in which each number equals the sum of the two preceding numbers
Fibonacci sequence <mathematics> 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)