Definition of formative adjective from the Oxford Advanced American Dictionary

 

formative

 adjective
adjective
NAmE//ˈfɔrmət̮ɪv//
 
[only before noun]
 
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having an important and lasting influence on the development of something or of someone's character the formative years of childhood formative influences in the development of the labor movement
See the Oxford Advanced Learner's Dictionary entry: formative