DOMAIN

noun Etymology: alteration of Middle English demayne, from Anglo-French demeine, from Latin dominium, from dominus Date: 15th century 1. complete and absolute ownership of land, land so owned, a territory over which dominion is exercised, a region distinctively marked by some physical feature , a sphere of knowledge, influence, or activity , the set of elements to which a mathematical or logical variable is limited, any of the small randomly oriented regions of uniform magnetization in a ferromagnetic substance, integral ~ , the highest taxonomic category in biological classification ranking above the kingdom, 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, 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 )