Definitions
1.nounOne who speaks.
2.nounLoudspeaker.
3.nounSpeakerphone.
4.nounThe chair or presiding officer of certain legislative bodies, such as the U.K. House of Commons or the U.S. House of Representatives.
5.nounOne who makes a speech to an audience."The company hired a motivational speaker to boost morale."
6.nounA book containing passages of text for use in speeches.
7.nounThe producer of a given utterance (text, etc), whether actually spoken or e.g. written.
8.nounA key on a woodwind instrument of the clarinet family (cf octave key on other instruments) which induces the instrument to overblow.