1. (n.) The act or art of composing and rendering music, poetry, and the like, extemporaneously; as, improvisation on the organ.

2. (n.) That which is improvised; an impromptu.

action ad hoc measure ad lib ad-libbing answer arrangement artifice authorship beginning cadenza coinage conception concoction contrivance contriving countermove coup course of action creation creative effort demarche device devising disqualification dodge effort expedient extemporaneousness extemporariness extempore extemporization fabrication flourish generation gimmick hatching hot lick impromptu improvision incapability incompetence interpolation invention jury-rig jury-rigged expedient lack of preparation last expedient last resort last shift lick makeshift making do maneuver means measure mintage move nonpreparation nonpreparedness origination pis aller planlessness playing by ear pro tempore resort resource riff shake-up shift solution step stopgap stratagem stroke stroke of policy tactic temporary arrangement temporary expedient temporary measure trick trump unfitness unfittedness unpreparedness unqualification unqualifiedness unreadiness unsuitability unsuitableness unsuitedness vamp vulnerability working hypothesis working proposition