speaker Definition

1. electronics.
An electronic device that converts electrical signals into audible sound waves, used in radio, television, telephone receivers, hi-fi systems, etc.
Thesaurus: amplifier, public address system, tweeter, woofer, loudhailer, bullhorn (US).

1. Someone who speaks, especially someone who gives a formal speech.

Thesaurus: orator, rhetorician, lecturer; spokesperson, spokesman, spokeswoman, mouthpiece, master of ceremonies, MC.
2. A shortened form of loudspeaker.
3. The person who presides over debate in a law-making assembly such as the House of Commons.

Form: the Speaker (usually)