ACK

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1. [common; from the ASCII mnemonic for 0000110] Acknowledge. Used to register one's presence (compare mainstream Yo!). An appropriate response to ping or ENQ.

2. [from the comic strip Bloom County] An exclamation of surprised disgust, esp. in “Ack pffft!” Semi-humorous. Generally this sense is not spelled in caps (ACK) and is distinguished by a following exclamation point.

3. Used to politely interrupt someone to tell them you understand their point (see NAK). Thus, for example, you might cut off an overly long explanation with “Ack. Ack. Ack. I get it now”.

4. An affirmative. “Think we ought to ditch that damn NT server for a Linux box?” “ACK!”

There is also a usage “ACK?” (from sense 1) meaning “Are you there?”, often used in email when earlier mail has produced no reply, or during a lull in talk mode to see if the person has gone away (the standard humorous response is of course NAK, i.e., “I'm not here”).

Look up ack in Wiktionary, the free dictionary.

ACK as an abbreviation that may refer to:

• Acknowledgement (data networks), a signal to acknowledge the receipt of data
• ACK, a flag used in the Transmission Control Protocol (TCP) to acknowledge receipt of a packet
• Acknowledge character, a control character used in ASCII
• Acklington railway station, a rail station in the United Kingdom
• Amar Chitra Katha, an Indian comic book series
• Amsterdam Compiler Kit, a fast, lightweight and retargetable compiler suite
• Nantucket Memorial Airport, a Massachusetts airport

Ack as a word may also refer to:

• "Ack ack", from signalese for AA, referring to a term for anti-aircraft artillery fire
• Armstrong Whitworth F.K.8, an early aircraft known as the "Big Ack"
• ack, a command-line utility similar to grep that uses the more extensive Perl regular expressions
• short for "Acknowledgement" (sometimes in the sense of acceptance) in online chat slang

See also

• Acknowledgment (disambiguation)

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