The definition of a domain is the area a given person or people rules or an area of knowledge.(noun)
The definition of a domain is a group of workgroups within the same company or organization that governs the ability of all the computers to communicate with other groups of computers both within and outside of the organization.
See domain in Webster's New World College Dictionary
Origin: ME domein < MFr domaine < L dominium, right of ownership, dominion < dominus, a lord: see dominate
See domain in American Heritage Dictionary 4
Origin: French domaine
Origin: , blend of Old French demaine (from Late Latin dominicum)
Origin: and Latin dominium, property
Origin: , both from dominus, lord; see dem- in Indo-European roots.
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