Definition of "MMS"

MMS

proper noun
1. (telecommunications) Initialism of Multimedia Messaging Service.
  Quotations
  Sending a picture taken with a phonecam as MMS may be fun on occasion, but sending thousands or millions of pictures is not the work of a casual user.
  2003, Scott B. Guthery, Mary J. Cronin, Developing MMS Applications
noun
plural MMSes
1. A message sent using Multimedia Messaging Service