Definition of "quodlibet"

(music) A form of music with melodies in counterpoint.  examples

(art) A form of trompe l'oeil which realistically renders domestic items (paper-knives, playing-cards, ribbons, etc).  examples

(card games) A card game that combines several different contracts.  examples

(philosophy) A mode of philosophical debate popular in the Middle Ages, in which any question could be posed extemporaneously.  examples