How can infinity be named infinity if it is undefinable?

Answer:
In-finity or in-finite means not finite, not ending. It can certain be defined; there are different definitions for infinity. Better look up "infinity" in Wikipedia; because actually, infinity has different meanings in different contexts; even in math there are different meanings, depending on the context.
First answer by Hilmarz. Last edit by Hilmarz. Contributor trust: 802 [recommend contributor recommended]. Question popularity: 1 [recommend question].