1. (noun) speaker, talker, utterer, verbalizer, verbaliser
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"
2. (noun) loudspeaker, speaker, speaker unit, loudspeaker system, speaker system
electro-acoustic transducer that converts electrical signals into sounds loud enough to be heard at a distance
3. (noun) Speaker
the presiding officer of a deliberative assembly
"the leader of the majority party is the Speaker of the House of Representatives"
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Definition of 'speaker' 
