What term refers to the variation in the form of a verb based on tense, mood, or person?

The term that refers to the variation in the form of a verb based on tense, mood, or person is "conjugation." Conjugation is a fundamental concept in grammar that describes how verbs change to express different times (past, present, future), modes (indicative, subjunctive, imperative), and the subject's person (first, second, third) and number (singular, plural). This systematic alteration allows sentences to convey precise meanings based on the actions or states described by the verb.

In contrast, the other terms do not relate directly to the variation of verbs. "Moiety" refers to a part or half of something, typically in a scientific context, particularly in chemistry or anthropology. "Noun" is a word that identifies a person, place, thing, or idea, while "elision" pertains to the omission of a sound or syllable in speech or writing. Understanding conjugation is crucial for mastering verb usage and achieving fluency in language.