Collins Concise English Dictionary © HarperCollins Publishers::

Fibonacci sequence, Fibonacci series /ˌfɪbəˈnɑːtʃɪ/ n
  1. the infinite sequence of numbers, 0, 1, 1, 2, 3, 5, 8, etc, in which each member (Fibonacci number) is the sum of the previous two
Etymology: named after Leonardo Fibonacci

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