infinitive
Pronunciation: /ɪnˈfɪnɪtɪv/
noun


Origin:
late Middle English (as an adjective): from Latin infinitivus, from infinitus (see infinite). The noun dates from the mid 16th century

Grammar
A form of the verb. In the verb phrase the infinitive has two forms: the verb stem. This form of the infinitive is used after modal auxiliary verbs such as must and should: to' plus the verb stem: