Longman Dictionary of Contemporary English homepage

speaker

noun
     
speakā€§er S2 W2 [countable]
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)
2SLL someone who speaks a particular language
speaker of
Some English words are difficult for speakers of other languages.
a native speaker of Chinese
speaker
3TCRAMT 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

PGPPGO 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

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