'Speaker' definitions:

Definition of 'speaker'

(from WordNet)
noun
Someone who expresses in language; someone who talks (especially someone who delivers a public speech or someone especially garrulous); "the speaker at commencement"; "an utterer of useful maxims" [syn: speaker, talker, utterer, verbalizer, verbaliser]
noun
Electro-acoustic transducer that converts electrical signals into sounds loud enough to be heard at a distance [syn: loudspeaker, speaker, speaker unit, loudspeaker system, speaker system]
noun
The presiding officer of a deliberative assembly; "the leader of the majority party is the Speaker of the House of Representatives"

Definition of 'Speaker'

From: GCIDE
  • Speaker \Speak"er\, n.
  • 1. One who speaks. Specifically: (a) 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. (b) One who is the mouthpiece of others; especially, one who presides over, or speaks for, a delibrative 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. [1913 Webster]
  • 2. A book of selections for declamation. [U. S.] [1913 Webster]

Synonyms of 'speaker'

From: Moby Thesaurus