Short for acknowledged. When a person says something that doesn't require a response, but the person wants to let them know they recieved the message. Similar to okay, but when using okay just won't do.
by JesusPirate July 06, 2010
by mistervague November 08, 2003
by mylifeisawk February 22, 2012
buy the domain for your foodie site
by Chris ACK June 07, 2005
In the TCP protocol, the receiving computer sends an ACK (acknowledgment) to the sending computer. This is basically how a coonection is established.
Sender sends 3 packets, Receiver receives 3 packets and sends "ACK 4" (meaning it received what was sent, and it's ok to send the next number or packet)
by Obi-Wan December 09, 2003
by Emily Winters January 05, 2005
by Fuzzwuzzy March 10, 2005