Indefinite

Indefinite may refer to:

• the opposite of Definiteness in grammar
• indefinite article
• indefinite pronoun
• Indefinite integral, another name for the antiderivative
• Indefinite forms in algebra: see definite quadratic forms
• an indefinite matrix
• the "indefinite" or apeiron in ancient Greek philosophy

• Eternity
• NaN
• Undefined (disambiguation)