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/ˈspiːkəˌfəʊn/ · noun
A telephone with a microphone and loudspeaker separate from those in the handset..
Use speakerphone when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Speakerphone means A telephone with a microphone and loudspeaker separate from those in the handset..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use speakerphone where its definition matches the intended context.
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