What does ack mean?

Looking for the meaning or definition of the word ack? Here's what it means.

Noun
  1. (military, now historical) The letter A as used in signalling and other types of communications.
  2. (data communications) acknowledgment signal
Interjection
  1. (radio communications) acknowledged
Interjection
  1. Expressing distaste, alarm, or trepidation.
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