(1913) a play by George Bernard Shaw in which Professor Henry Higgins teaches a poor Cockney woman, Eliza Doolittle, how to speak and behave like an upper class lady. The play was made into a musical (=a play that uses singing and dancing to tell a story) in 1956 and a successful film musical in 1964, both called My Fair Lady.
Definition from the Longman Dictionary of Contemporary English Advanced Learner's Dictionary.