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Definition word family in British English

word family noun

[countable] noun
/ˈwɜː(r)d ˌfæm(ə)li/
1

a group of words that share the same root but have different affixes, for example 'help', 'helpful', 'helpless', 'helper' and 'unhelpful'

Synonyms and related words
Definition word family in British English