c.1300, "communication transmitted via a messenger," from O.Fr. message, from M.L. missaticum, from L. missus, pp. of mittere "to send." The L. word is glossed in O.E. by ærende. Specific religious sense of "divinely inspired communication via a prophet" (1540s) led to transferred sense of "the broad meaning (of something)," first attested 1828. As a verb, "to send messages," attested from 1580s. To get the message "understand" is from 1964.
To send a message on the Internet •The sense ''to send a message'' is found by 1583: '' I need to do it,'' Baker messaged a man with whom he had been discussing rape, torture, and murder(1990s+ Computer)
The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D. Copyright (C) 2007 by HarperCollins Publishers. Cite This Source