Ack
ack definition by Slang.net - The Slang Dictionary
This page explains what the abbreviation "ack" means. The definition, example, and related terms listed above have been manually compiled and written by the Slang.net team.
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Ack is an abbreviation people use when messaging (via texts and online) to confirm understanding. For example, if your friend sends you information about an upcoming get-together, you might reply with "Ack. Will be there."
Not many people use ack, and the ones who do are usually slang-savvy teenagers or young adults. Also, Cathy, the comic strip character, is well known for using the abbreviation.
Since most people won't understand ack, you might want to use a different term to communicate understanding. Other options include OK, bet, SG, and gotcha.