axis.
An imaginary line around which an object spins (an axis of rotation) or is symmetrically arranged (an axis of symmetry).
Meaning & usage
An imaginary line around which an object spins (an axis of rotation) or is symmetrically arranged (an axis of symmetry).
The Earth rotates once a day on its axis
A fixed one-dimensional figure, such as a line or arc, with an origin and orientation and such that its points are in one-to-one correspondence with a set of numbers; an axis forms part of the basis of a space or is used to position and locate data in a graph (a coordinate axis)
The second cervical vertebra of the spine
An imaginary, visualized plane separating two morphologically similar parts of an organism
A form of classification and descriptions of mental disorders or disabilities used in manuals such as the DSM (Diagnostic and Statistical Manual of Mental Disorders)
The main stem or central part about which organs or plant parts such as branches are arranged
An alliance or coalition.
The centre of attention within a process (e.g. the axis of investigation)
Where this word comes from
Etymology tree Proto-Indo-European *h₂eǵ-? Proto-Indo-European *-os Proto-Indo-European *h₂eḱs-der. Proto-Italic *aksis Latin axisbor. English axis Borrowed from Latin axis (“axle, axis”) in the 16th century. Via Latin cognate with ala, aisle, atelier. Via Proto-Indo-European *h₂eḱs- cognate with inherited English axle and borrowed axo-, axon.
A deer native to Asia, of species Axis axis.
Where this word comes from
From Latin, name of an Indian animal mentioned by the Roman senator Pliny.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.