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Meaning of plain old telephone service | Babel Free

Noun CEFR C2

Definitions

A traditional telephony system based on the analog transmission of sound, as opposed to newer alternatives like ISDN or VoIP.

uncountable

CEFR level

C2
Mastery
This word is part of the CEFR C2 vocabulary — mastery level.

See also

plain paper plain people plain point plain pug plain radiography plain sailing

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