formative


Concise Oxford English Dictionary © 2008 Oxford University Press:
formative/ˈfɔːmətɪv/
adjective serving to form something, especially having a profound influence on a person's development.

Linguistics denoting or relating to any of the smallest meaningful units that are used to form words in a language, typically combining forms and inflections.

– derivatives
formatively adverb.
'formative' also found in these Oxford entries:

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