infinitive (infinitival): a non-finite form of a verb which is used to refer to the action in the abstract, without specifying who did it, when, etc. In English, the infinitive is the form of the verb that occurs with or after "to", such as "(to) be" and "(to) walk". It tends to serve as the "name" of the verb; for example dictionaries generally list verbs in their infinitive form. Contrast participle. [Spanish: infinitivo [2]]