(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 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.

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.

(chiefly US) An optometrist or ophthalmologist.

A practitioner of family medicine.

A professional doctorate in law, and in some countries, a first professional graduate degree.

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.

To pretend to be doctor and patient as a form of child play.