- Noun. Limitlessness, unlimitedness, something which is growing without limits or bounds.
- Noun. A number that has an infinite numerical value that cannot be counted.
- Noun. A number which is very large compared to some characteristic number. For example, in optics, an object which is much further away than the focal length of a lens is said to be "at infinity", as the distance of the image from the lens varies very little as the distance increases further.
- Noun. The symbol ∞.