"messaging" in the noun sense
1. messaging, electronic messaging
the sending and processing of e-mail by computer
"messaging" in the verb sense
1. message
send a message to
"She messaged the committee"
2. message
send as a message
"She messaged the final report by fax"
3. message
send a message
"There is no messaging service at this company"
Source: WordNet® (An amazing lexical database of English)
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