noun plural Date: 1870 a series of verb forms from which all the other forms of a verb can be derived including in English the infinitive, the past tense, and the present and past participles
PRINCIPAL PARTS
Meaning of PRINCIPAL PARTS in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012