n. pl. in·fin·i·ties 1. The quality or condition of being infinite.
2. Unbounded space, time, or quantity.
3. An indefinitely large number or amount.
4. Mathematics The limit that a function is said to approach at x = a when (x) is larger than any preassigned number for all x sufficiently near a.
5. a. A range in relation to an optical system, such as a camera lens, representing distances great enough that light rays reflected from objects within the range may be regarded as parallel.
b. A distance setting, as on a camera, beyond which the entire field is in focus.