adjective: of or involving the mouth or mouth region or the surface on which the mouth is located
Example: "The oral cavity"
adjective: using speech rather than writing
Example: "An oral tradition"
adjective: of or relating to or affecting or for use in the mouth
Example: "Oral hygiene"
adjective: a stage in psychosexual development when the child's interest is concentrated in the mouth; fixation at this stage is said to result in dependence, selfishness, and aggression