# Fibonacci numbers

[fee-boh-nah-chee]

- the unending sequence 1, 1, 2, 3, 5, 8, 13, 21, 34, … where each term is defined as the sum of its two predecessors.

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## Origin of Fibonacci numbers^{}

1890–95; after Leonardo Fibonacci, 13th-century Italian mathematician

Also called Fibonacci sequence.

Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

## Fibonacci sequence

### Fibonacci series

- 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

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## Word Origin

named after Leonardo Fibonacci

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

## Fibonacci sequence

- A sequence of numbers, such as 1, 1, 2, 3, 5, 8, 13 … , in which each successive number is equal to the sum of the two preceding numbers. Many shapes occurring in nature, such as certain spirals, have proportions that can be described in terms of the Fibonacci sequence. See also golden section.

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The American Heritage® Science Dictionary
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