If something is infinite, it has no end or limit. It can be used for numbers, space, time, or even very large amounts that feel endless.
It comes from Latin “infinitus,” meaning “unbounded” or “without end,” from “in-” (not) and “finis” (end, limit). The word moved into English through Old French.
Infinite literally means “no finish,” which is why it fascinates mathematicians and philosophers. There isn’t just one infinity in math—there are actually different sizes of infinity, some bigger than others. So a word that sounds like pure imagination turns out to be a serious mathematical concept.
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