noun a quantity greater than any assignable quantity of the same kind.
2. infinity ·noun endless or indefinite number; great multitude; as an infinity of beauties.
3. infinity ·noun unlimited extent of time, space, or quantity; eternity; boundlessness; immensity.
4. infinity ·noun unlimited capacity, energy, excellence, or knowledge; as, the infinity of god and his perfections.
5. infinity ·noun that part of a line, or of a plane, or of space, which is infinitely distant. in modern geometry, parallel lines or planes are sometimes treated as lines or planes meeting at infinity.