(countable) A belief or tenet, especially about philosophical or theological matters.

A physician; a member of the medical profession; one who is trained and licensed to heal the sick or injured. The final examination and qualification may award a doctor degree in which case the post-nominal letters are D.O., DPM, M.D., DMD, DDS, in the US or MBBS in the UK.

(transitive) To act as a medical doctor to. / (intransitive, humorous) To act as a medical doctor. / (transitive) To make (someone) into an (academic) doctor; to confer a doctorate upon.

A terminal degree similar to an Ed.D. or a Ph.D., but with a focus on content speciality; it may be conferred as a prestigious honorary doctorate with the added designation of "honoris causa". Commonly abbreviated DA.

A terminal degree intended for musicians who wish to combine the highest attainments in their major area with proven accomplishment in theoretical studies and musicology.

Relating to a doctorate. / Pertaining to a medical doctor or physician.

The highest degree awarded by a university faculty.

(archaic) To make (someone) into a doctor.

A person who is believed to ward off witchcraft and heal through magical powers; a shaman.

Used other than figuratively or idiomatically: see doctor, -'s, orders. / (Britain, bingo) The number nine.