"To be or not to be?" In his most famous line, Hamlet was using the infinitive form of the verb "be." The infinitive form of a verb is its most basic form, usually its "to" version.

The word infinitive comes from the Latin infinitus meaning "unbounded, unlimited." When a verb is in its infinite form, it's not limited or bound by its subject or tense. Contrast "to be" with "was" — was is tied to the past tense and a single person. Strip away the word to from "to be" and you have what's known as a bare infinitive. Keep the to there and you've got a full infinitive.

Definitions of infinitive
  1. noun
    the uninflected form of the verb
    see moresee less
    split infinitive
    an infinitive with an adverb between `to' and the verb (e.g., `to boldly go')
    type of:
    the word class that serves as the predicate of a sentence
Word Family

Test prep from the experts

Boost your test score with programs developed by’s experts.

  • Proven methods: Learn faster, remember longer with our scientific approach.
  • Personalized plan: We customize your experience to maximize your learning.
  • Strategic studying: Focus on the words that are most crucial for success.


  • Number of words: 500+
  • Duration: 8 weeks or less
  • Time: 1 hour / week


  • Number of words: 500+
  • Duration: 10 weeks or less
  • Time: 1 hour / week


  • Number of words: 700+
  • Duration: 10 weeks
  • Time: 1 hour / week