Definitions from Wiktionary ( )

▸ noun:  (countable) A deciduous tree with distinctive deeply lobed leaves, acorns, and notably strong wood, typically of England and northeastern North America, included in genus Quercus.
▸ noun:  (uncountable) The wood of the oak.
▸ noun:  A rich brown colour, like that of oak wood.
▸ noun:  Any tree of the genus Quercus, in family Fagaceae.
▸ noun:  Any tree of other genera and species of trees resembling typical oaks of genus Quercus in some ways.
▸ noun:  The she-oaks in Allocasuarina and Casuarina, of family Casuarinaceae
▸ noun:  Lagunaria, white oak, in family Malvaceae
▸ noun:  Various species called silky oak, in family Proteaceae
▸ noun:  Toxicodendron, poison oak, in family Anacardiaceae
▸ noun:  Various tanbark oak or stone oak species in family Fagaceae, genera Lithocarpus and Notholithocarpus.
▸ noun:  The outer (lockable) door of a set of rooms in a college or similar institution. (Often in the phrase sport one's oak.)
▸ noun:  (wine) The flavor of oak.
▸ adjective:  Having a rich brown colour, like that of oak wood.
▸ adjective:  Made of oak wood or timber.
▸ verb:  (wine, transitive) To expose to oak in order for the oak to impart its flavors.

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