past participle
US /pæst pɑːrˈtɪs.ə.pəl/
UK /pæst pɑːrˈtɪs.ə.pəl/

1.
a nonfinite verb form that has some characteristics of an adjective and is used in forming perfect tenses and passive voices.
:
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The word 'eaten' is the past participle of 'eat'.
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In the sentence 'The book was written by him', 'written' is a past participle.