Noah Webster's New International Dictionary of the English Language

1. (n.) One who speaks.

2. (n.) One who utters or pronounces a discourse; usually, one who utters a speech in public; as, the man is a good speaker, or a bad speaker.

3. (n.) One who is the mouthpiece of others; especially, one who presides over, or speaks for, a deliberative assembly, preserving order and regulating the debates; as, the Speaker of the House of Commons, originally, the mouthpiece of the House to address the king; the Speaker of a House of Representatives.

4. (n.) A book of selections for declamation.