1 a low continuous humming sound: he nodded off to the drone of the car engine.
• informal a monotonous speech: only twenty minutes of the hour-long drone had passed.
• a continuous musical note, typically of low pitch.
• a musical instrument, or part of one, sounding a continuous note, in particular (also drone pipe) a pipe in a bagpipe or (also drone string) a string in an instrument such as a hurdy-gurdy or a sitar.
2 a male bee in a colony of social bees, which does no work but can fertilize a queen.
• a person who does no useful work and lives off others.
3 a remote-controlled pilotless aircraft or missile.