a/d

a/d (autodial) automatic dialling feature a/d (assistant director) first assistant to the director whose duties include following the progress of filming against the schedule of production and also preparing call sheets (Movie Business); aid to a manager or director a/d (aerodrome) (British) airport, location used for aircraft landing and takeoff a/d (analog/digital) item which is analogous to another using numbers a/d (advance/decline line) tool used to calculate the total of differences between advances and declines of security prices