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Domain

(Science: molecular biology) Used to describe a part of a molecule or structure that shares common physico chemical features, for example hydrophobic, polar, globular, helical domains or properties for example dna binding domain, atp binding domain.

Domain (2nd meaning)

(Science: general biology) The highest order of life classification ("super kingdoms"), based on the distinct lineages of life, through which they have been evolving independently from one another for over 1.5 billin years. there are 3 distinctive domains present in the world, that are widely accepted by scientist: Domain bacteria & domain archaea are both prokaryotic(meaning they have no nucleus), while domain eukarya is eukaryotic. Domain eukarya includes all multicellular organisms, including protists, animals, fungi, and plants. All life on earth is considered to have a common universal ancestor, Progenote.