Definition of principal parts noun from the Oxford Advanced Learner's Dictionary


principal parts

BrE BrE//ˌprɪnsəpl ˈpɑːts//
; NAmE NAmE//ˌprɪnsəpl ˈpɑːrts//
[plural] (grammar)
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the forms of a verb from which all the other forms can be made. In English these are the infinitive (for example swim), the past tense (swam) and the past participle (swum).
See the Oxford Advanced American Dictionary entry: principal parts