Fibonacci number

noun

Fi·​bo·​nac·​ci number ˌfē-bə-ˈnä-chē- 

ˌfi-bə-

: an integer in the infinite sequence 1, 1, 2, 3, 5, 8, 13, … of which the first two terms are 1 and 1 and each succeeding term is the sum of the two immediately preceding

Word History

Etymology

Leonardo Fibonacci †about 1250 Italian mathematician

First Known Use

1914, in the meaning defined above

Kids Definition

Fibonacci number

noun

Fi·​bo·​nac·​ci number ˌfē-bə-ˈnäch-ē- 

ˌfib-ə-

: any of the integers in the infinite sequence 1, 1, 2, 3, 5, 8, 13 … of which the first two terms are 1 and 1 and each following term is the sum of the two just before it

Etymology

named for Leonardo Fibonacci about 1170–about 1240 Italian mathematician