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speaker

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speaker
speaker S2 W2 /ˈspiːkə $ -ər/ noun [countable]
 Word Family: adjective: unspeakable, speechless, outspoken, spokenunspoken; noun: speaker, speech; verb: speak; adverb: unspeakably
1. someone who makes a formal speech to a group of people
    speaker at
    the guest speaker at the conference
    The keynote speaker (=main or most important speaker) was Robert Venturi, the architect.
    after-dinner speaker (=someone who makes a speech after a formal meal)
2. someone who speaks a particular language
    French-speaker/Spanish-speaker etc
    speaker of
    Some English words are difficult for speakers of other languages.
    a native speaker of Chinese
3.
  the part of a radio, sound system etc where the sound comes out
4. formal someone who says something:
    Pay attention to the body language of the speaker.
5. the Speaker an official who controls discussions in a parliament
6. the Speaker of the House the politician who controls discussions in the House of Representatives in the US Congress
     
COLLOCATIONS
■ ADJECTIVES/NOUN + speaker
    a public speaker He was a good public speaker.
    an after-dinner speaker (=someone who makes speeches after formal meals) As every after-dinner speaker knows, a joke or two is always much appreciated.
    the guest speaker The guest speaker will be the Secretary of State for Health.
    the keynote/main speaker (=the most important speaker) the keynote speaker at the seminar, Dr Paul Messina