domain.
A geographic area owned or controlled by a single person or organization.
Meaning & usage
A geographic area owned or controlled by a single person or organization.
The king ruled his domain harshly.
A field or sphere of activity, influence or expertise.
Dealing with complaints isn't really my domain: get in touch with customer services.
His domain is English history.
A group of related items, topics, or subjects.
The set of input (argument) values for which a function is defined.
The set of input (argument) values for which a function is defined. The set A; The subset of A consisting of elements a of A such that there exists an element b in B with (a,b) in R.
A ring with no zero divisors; that is, in which no product of nonzero elements is zero.
An open and connected set in some topology. For example, the interval (0,1) as a subset of the real numbers.
Any DNS domain name, particularly one which has been delegated and has become representative of the delegated domain name and its subdomains.
A collection of DNS or DNS-like domain names consisting of a delegated domain name and all its subdomains.
A collection of information having to do with a domain, the computers named in the domain, and the network on which the computers named in the domain reside.
The collection of computers identified by a domain's domain names.
A small region of a magnetic material with a consistent magnetization direction.
Such a region used as a data storage element in a bubble memory.
A form of technical metadata that represent the type of a data item, its characteristics, name, and usage.
The highest rank in the classification of organisms, above kingdom; in the three-domain system, one of the taxa Bacteria, Archaea, or Eukaryota.
A folded section of a protein molecule that has a discrete function; the equivalent section of a chromosome.
An area of more or less uniform mineralization.
Where this word comes from
Etymology tree Proto-Indo-European *dem- Proto-Indo-European *-s Proto-Indo-European *dṓmder. Proto-Italic *domanos Latin dominus Proto-Indo-European *-(i)yós Proto-Italic *-ijos Proto-Italic *-ios Old Latin -ios Latin -iusnom. Latin -ium Latin dominiumder. Old French demainebor. Middle English demayne English domain From Middle English demayne, demain (“rule”), from Old French demeine, demaine, demeigne, domaine (“power”), (French domaine), from Latin dominium (“property, right of ownership”), from dominus (“master, proprietor, owner”). Doublet of demesne and dominium, and closely related to dominion and domino. See also dame, and compare demain, danger, dungeon.
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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.