Read the dictionary definition of drone. All definitions for this word.
1. stingless male bee in a colony of social bees (especially honeybees) whose sole function is to mate with the queen
2. a pipe of the bagpipe that is tuned to produce a single continuous tone
3. an aircraft without a pilot that is operated by remote control
4. an unchanging intonation
5. someone who takes more time than necessary; someone who lags behind
6. talk in a monotonous voice
7. make a monotonous low dull sound
1. The harmonium was droning on