the construction or operation of telephones or telephonic systems.
a system of telecommunications in which telephonic equipment is employed in the transmission of speech or other sound between points, with or without the use of wires.

1825–35; telephone + -y3 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
telephony (tɪˈlɛfənɪ)
a system of telecommunications for the transmission of speech or other sounds

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Computing Dictionary

telephony definition

Communication, often two-way, of spoken information, by means of electrical signals carried by wires or radio waves. The term was used to indicate transmission of the voice, as opposed to telegraphy (done in Morse code and usually called "continuous wave" or CW transmission), radio teletypewriter (RTTY) transmission (also called FSK for "Frequency Shift Keying", the modulation scheme used by such machines), and later, facimile.

The Free On-line Dictionary of Computing, © Denis Howe 2010
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Encyclopedia Britannica


instrument designed for simultaneous two-way voice communication and the technological system through which it is employed. It is a central part of modern telecommunication.

Learn more about telephony with a free trial on

Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Among other things, this episode has been an examination of the advantages and
  ills of home telephony.
On the face of it, file-swapping and telephony have little in common.
Already, mobile telephony is transforming the landscape.
Ability to read standard telephony color code and to distinguish between
  color-coded wires.
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