past participle (past participles plural )In grammar, the past participle of a verb is a form that is usually the same as the past form and so ends in `-ed'. A number of verbs have irregular past participles, for example `break' - past participle `broken', and `come' - past participle `come'. Past participles are used to form perfect tenses and the passive voice, and many of them can be used like an adjective in front of a noun. n-count