The transmission of sound between distant stations, especially by radio or telephone. (noun)
The technology and manufacture of telephone equipment. (noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "telephony" in a sentence
"Now as far as the frequency for GSM goes, in telephony it is quad band so no worries there."
"The future of mobile telephony is more along the lines of pay-as-you-go and Tracfone."
"That said, Ooma seems to be the first VoIP company to realize that internet-enabled telephony is capable of so much more than just placing and receiving calls at discount rates."