infinity noun

1 endless space/time

VERB + INFINITY extend into/to, stretch into/to Theoretically, a line can extend into infinity.

PREP. at ~ Parallel lines meet at infinity. | into ~ In this weather the cliff face was a foggy drop into infinity.

2 number larger than any other

VERB + INFINITY approach, tend to/towards As x approaches infinity y approaches zero.

PREP. at ~ The usual convention is to choose the reference point at infinity.