ˌafrəˈtän(ˌ)dō, ˌäf- adjective
Etymology: Italian, literally, hastening, verbal of affrettare to hasten, from a- (from Latin ad- ) + fretta haste, from frettare to rub, from (assumed) Vulgar Latin frictare, from Latin frictus, past participle of fricare to rub — more at brine
: becoming faster, as if excited — used as a direction in music