What does infinity mean?
Infinity is the idea of something having no limit, boundary, or end. In mathematics, it describes quantities or processes that can continue indefinitely and is treated as a concept rather than an ordinary number. In everyday and literary use, it can refer to boundless space or time, unlimited possibility, or a feeling of profound awe. Phrases such as “point at infinity” and “the infinity symbol” belong to technical or broadly familiar mathematical language, while figurative expressions often suggest that the possibilities before a person are limitless. The word is especially useful when discussing both the precision of mathematical thought and the human tendency to imagine what cannot be measured, completed, or bounded. Its associations with vastness and mystery make it prominent in discussions of the universe, eternity, love, knowledge, and creative possibility.
nounThe state of having no limit or end, especially the mathematical concept of an unbounded quantity. In figurative use, it refers to limitless time, possibility, or emotional or intellectual depth.
- The state of being without limit, end, or boundary.
- An indefinitely great number or quantity, especially in mathematics.
- Boundless time, possibility, or emotional and intellectual depth.
"She stared into the darkness, lost in a sense of infinite possibility."
"The model assumes the sequence continues to infinity."
"Looking into the star-filled sky, he felt overwhelmed by the infinity of the universe."
The plural is uncommon in ordinary prose but is used in mathematics when referring to distinct kinds or magnitudes of infinite quantity.
"Mathematicians can compare two different infinities without assuming that they have the same size."
The infinity sign resembles a sideways figure eight, a visual reminder that its two loops remain one continuous, unbroken curve.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does infinity come from?
The word entered English from Old French infinité, which was derived from Latin infinitas, meaning “boundlessness.” Latin infinitas in turn came from infinitus, formed from the prefix in- and the Latin root finis, “end, limit.” The same root underlies English words such as finite, final, finale, and definitive, while its absence produces the modern conception of infinity.
Related word forms
How infinity is actually used
The term is common in mathematics and formal or reflective writing. Figurative uses often convey awe, vastness, or unlimited possibility and can sound deliberately dramatic.
Easily confused with infinity
Infinity denotes boundlessness or limitless magnitude, whereas eternity specifically means endless time.
Immensity emphasizes great size, while infinity emphasizes the absence of a limit.