Meaning of “speaker” in the English Dictionary

"speaker" in British English

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speakernoun [ C ]

uk /ˈspiː.kər/ us /ˈspiː.kɚ/

speaker noun [ C ] (FORMAL TALK)

B1 a person who gives a speech at a public event:

a good public speaker
Please join with me in thanking our guest speaker tonight.
The Democrats have chosen the Texas state treasurer as the keynote (= most important) speaker at their convention.

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Speakernoun [ C ]

uk /ˈspiː.kər/ us /ˈspiː.kɚ/

(Definition of “speaker” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"speaker" in American English

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speaker noun [ C ] (ELECTRICAL EQUIPMENT)

us /ˈspi·kər/ a piece of electrical equipment through which recorded or broadcast sound can be heard:

We bought new speakers for our stereo system.

speaker noun [ C ] (PERSON WHO KNOWS A LANGUAGE)

us /ˈspi·kər/ someone who speaks a particular language:

a French/Chinese speaker

speaker noun [ C ] (PERSON WHO GIVES FORMAL TALK)

us /ˈspi·kər/ a person who gives a speech at a public event:

There will be three speakers at the graduation ceremony.
She’s not a good public speaker.

us /ˈspi·kər/ A speaker is also the person who controls the way in which business is done in an organization which makes laws, such as the US House of Representatives:

the Speaker of the House

speaker noun [ C ] (PERSON SPEAKING)

/ˈspi·kər/ a person who speaks or is speaking:

Will the speaker please identify herself?

literature /ˈspi·kər/ The speaker in a work of literature is the person who is imagined to be saying the written words, or the character who speaks a monologue (= a long speech)

(Definition of “speaker” from the Cambridge Academic Content Dictionary © Cambridge University Press)