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English definition of “speaker”

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speaker

noun [C] uk   /ˈspiː.kər/ us    /-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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speaker noun [C] (LANGUAGE)

B1 someone who speaks a particular language: a French speaker a fluent Russian speaker non-English speakers

speaker noun [C] (ELECTRICAL)

A2 the part of a radio, television, or computer, or of a piece of electrical equipment for playing recorded sound, through which the sound is played. A speaker can be part of the radio, etc. or be separate from it: There's no sound coming out of the right-hand speaker.
(Definition of speaker noun from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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