Main Entry: do·main

Pronunciation: \dō-ˈmān, də-\

Function: noun

Etymology: alteration of Middle English demayne, from Anglo-French demeine, from Latin dominium, from dominus

Date: 15th century

1 a : complete and absolute ownership of land — compare eminent domain b : land so owned
2 : a territory over which dominion is exercised
3 : a region distinctively marked by some physical feature <the domain of rushing streams, tall trees, and lakes>
4 : a sphere of knowledge, influence, or activity <the domain of art>
5 : the set of elements to which a mathematical or logical variable is limited; specifically : the set on which a function is defined
6 : any of the small randomly oriented regions of uniform magnetization in a ferromagnetic substance
7 : integral domain
8 : the highest taxonomic category in biological classification ranking above the kingdom
9 : any of the three-dimensional subunits of a protein that are formed by the folding of its linear peptide chain and that together make up its tertiary structure
10 : a subdivision of the Internet consisting of computers or sites usually with a common purpose (as providing commercial information) and denoted in Internet addresses by a unique abbreviation (as com or gov); also : domain name