Related to Infinitive mood: infinitival
|(Gram.)||that form of the verb which merely names the action, and performs the office of a verbal noun. Some grammarians make two forms in English: (a) The simple form, as, speak, go, hear, before which to is commonly placed, as, to speak; to go; to hear. (b) The form of the imperfect participle, called the infinitive in -ing; as, going is as easy as standing.|
See also: Infinitive
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.