Infinity definition

From Latin infinitas, unlimitedness, from negative prefix in-, not, + finis, end, + noun of state suffix -tas

Limitlessness, unlimitedness, something which is growing without limits or bounds.
A number that has an infinite numerical value that cannot be counted.
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.
The symbol ∞.