Fibonacci number

noun Fi·bo·nac·ci number \ ˌfē-bə-ˈnä-chē- , ˌfi-bə- \

Definition of Fibonacci number

: 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

Origin and Etymology of fibonacci number

Leonardo Fibonacciabout 1250 Italian mathematician


Seen and Heard

What made you want to look up Fibonacci number? Please tell us where you read or heard it (including the quote, if possible).

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

WORD OF THE DAY

widely and unfavorably known

Get Word of the Day daily email!

Test Your Vocabulary

Words for Summer: A Quiz

  • a-closeup-of-a-sunflower
  • Which of the following words means “of or relating to summer”?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
Citation

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!