What is the meaning of oral?

noun

• An examination conducted by spoken communication.
  • synonyms: oral exam, oral examination, viva voce, viva

adjective

• Using speech rather than writing.
  • usage: "an oral tradition"; "an oral agreement"
  • synonyms: unwritten
• Of or relating to or affecting or for use in the mouth.
  • usage: "oral hygiene"; "an oral thermometer"; "an oral vaccine"
• Of or involving the mouth or mouth region or the surface on which the mouth is located.
  • usage: "the oral cavity"; "the oral mucous membrane"; "the oral surface of a starfish"
• 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. .