1. Relating to or belonging to the mouth: The dentist reminded Jill to continue good oral hygiene in order to avoid the possibilities of cavities..
2. Designed for use in the mouth: One oral device is the common toothbrush!
3. Expressed in spoken form as distinct from written form: Each student had to stand up and give an oral report in front of the class.
4. A reference to medicines that are taken by mouth: Dr. Lawson told Jim to gargle and wash his mouth with the oral fluid he wanted to prescribe for him.
5. Referring to vocal articulation through the mouth only: An oral speech sound can be produced by means of an airstream that escapes only through the mouth with the nasal cavity sealed off by the velum.
6. In Freudian analysis, a descriptive stage in child development when erotic pleasure is derived from mouth-associated sensations: Oral enjoyment is obtained especially through feeding, thumb-sucking, and putting objects into the mouth.
7. In Freudian analysis, a description of a dependent, selfish, and aggressive personality type with a tendency to derive pleasure from mouth-related activities: Oral satisfactions can be eating, drinking, smoking, etc.
8. In biology, pertaining to where the mouth is sited: The oral opening of a starfish is located on the underside surface of its body.
9. In education, regarding an examination, or test, that involves candidates giving spoken answers to spoken questions: The final exams included oral tests in addition to those with questions and answers in written form.

A pleonasm or a redundant phrase: The women talked among themselves in an oral conversation, which turned out to be quite boring because they repeated themselves too much.

A burning sensation in one or several parts of the mouth: Mildred's neighbor, Edward, consulted Dr. Carsley, the dentist, about the oral dyesthesia he was experiencing.

Oral dyesthesia occurs more often in the elderly and is generally related to menopausal, psychological, or psychopathological factors.

Identified causes of oral dyesthesia are denture irritation, yeast infection, decreased salivary production, and systemic factors, such as nutritional and estrogen deficiencies, and sensory neuropathies.

Treatment of oral dyesthesias consists of therapy for whatever has caused the condition.

A collection and study of historical information using sound recording of interviews with people having personal knowledge of past events: Mr. Smart, Jim's teacher, asked the students to collect important historical information about families, important events, or even about everyday life with the use of audio tapes, video tapes, or recordings on the phones to present an oral history in class the following week.

A branch of surgery that treats deformities, injuries, or diseases of the teeth and jaw; as well as, other areas of the face and mouth: Surgeons doing oral surgery are usually qualified dentists who have done further training in oral and maxillofacial (jaws and face) surgery.