Definition of infinity
plural infinities
1 a
: the quality of being infinite
b
: unlimited extent of time, space, or quantity : boundlessness
2
: an indefinitely great number or amount
- an infinity of stars
3 a
: the limit of the value of a function or variable when it tends to become numerically larger than any preassigned finite number
b
: a part of a geometric magnitude that lies beyond any part whose distance from a given reference position is finite
- do parallel lines ever meet if they extend to infinity
c
: a transfinite number (such as aleph-null)
4
: a distance so great that the rays of light from a point source at that distance may be regarded as parallel
