# Fibonacci numbers

[fee-boh-nah-chee]

### plural noun Mathematics.

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

## 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. 2019

## Fibonacci sequence

### Fibonacci series

### noun

## Word Origin for Fibonacci sequence

named after Leonardo Fibonacci

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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## Fibonacci sequence

The American Heritage® Science Dictionary
Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.