autoschediasm

1835–45; <Greek autoschedíasma, derivative, with -(s)ma resultative noun suffix, of autoschediázein to extemporize, verbal derivative of autoschédios hand-to-hand, offhand, improvised, equivalent to auto-auto-¹ + schédios near, casual, offhand, derivative of schedón (adv.) near, close by, akin to échein to hold, possess