Definition of ACK
ACK 
interjection
- as a question, to enquire whether someone is present.
Speaker: ACK?
Response: ACK.by Anonymous, Sep 28 2008.
- to affirm one's presence. An appropriate response to ping.
Speaker: Are you there?
Response: ACK.Speaker: ping
Response: ACK.by Anonymous, Sep 28 2008.
- an exclamation of surprise or alarm.
Ack!
by Anonymous, Sep 28 2008.
- yes.
Speaker: Do you want to shop for monitors?
Response: ACK.by Anonymous, Sep 28 2008.
origin
- ACK is an abbreviation of "acknowledged," used commonly in computing. See also NAK. Note that "ack" as an exclamation of surprise or alarm has no relation to computing.
by The Jargon File, Sep 28 2009.
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