• noun:   (phonetics) an individual sound unit of speech without concern as to whether or not it is a phoneme of some language
• noun:   electronic equipment that converts sound into electrical signals that can be transmitted over distances and then converts received signals back into sounds

  Example: "I talked to him on the telephone"

• noun:   electro-acoustic transducer for converting electric signals into sounds; it is held over or inserted into the ear

  Example: "It was not the typing but the earphones that she disliked"

• verb:   get or try to get into communication (with someone) by telephone

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