Pronunciation: ˌ f ē -b ə - ' nä-ch ē -, ˌ fi-b ə -
Function: noun
Etymology: Leonardo Fibonacci † about 1250 Italian mathematician
Date: 1914
: 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