Definition of Fibonacci series noun from the Oxford Advanced Learner's Dictionary

 

Fibonacci series

 noun
noun
BrE BrE//ˌfɪbəˈnɑːtʃi sɪəriːz//
 
; NAmE NAmE//ˌfɪbəˈnɑːtʃi sɪriːz//
 
(mathematics)
 
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a series of numbers in which each number is equal to the two numbers before it added together. Starting from 1, the series is 1,1,2,3,5,8,13, etc.
See the Oxford Advanced American Dictionary entry: Fibonacci series