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ack

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ACK¹

noun ACKs · ack

  1. An acknowledgement either of a packet or a message received from a network.

Opposite: NAK

verb ACKs · ACKing · ACKed · ack

  1. To acknowledge a packet or a message received from a network. Yet, with full ECN nonce functionality and totally unreliable behaviour, ACKing individual packets only would require the receiver to maintain state that could theoretically grow without bounds.

ack²

  • /æk/

Rhymes with -æk

Where it comes from

Clipping of acknowledged.

noun acks · ACK

  1. historical The letter A as used in signalling and other types of communications. They had to begin at the beginning: learning the Morse code, flag-wagging, a succession of acks, and practice on the buzzer.
  2. acknowledgment signal

Opposite: nack, nak

verb acks · acking · acked

  1. alternative Alternative form of ACK

interjection

  1. acknowledged

ack³

  • /æ(ː)k/
  • /æ(ː)x/

Rhymes with -æk

Where it comes from

Imitative. Etymology 2, interjection sense 2 is first attested in the latter part of September, 2021 on /qa/ - Question & Answer, from which it appears to have originated.

interjection

  1. Expressing distaste, alarm, or trepidation.
  2. offensive Mocking a transgender person by imitating the sound of choking during a suicide by hanging, evoking the notion that transgender people frequently commit suicide. ACK!

verb acks · acking · acked

  1. offensive, reflexive To commit suicide. Ack yourself.

Thesaurus

noun

Opposite: NAK

noun

Opposite: nack, nak

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Cite this
MLA

"ack." Wiktionary, via Micwyn, micwyn.com/word/ack. Accessed 6 Nov. 2026.

APA

ack. (n.d.). In Wiktionary, via Micwyn. Retrieved November 6, 2026, from https://micwyn.com/word/ack

Chicago

"ack." Wiktionary, via Micwyn. Accessed November 6, 2026. https://micwyn.com/word/ack.

BibTeX
@misc{ack_2026,
  title = {ack},
  howpublished = {Wiktionary, via Micwyn},
  year = {2026},
  url = {https://micwyn.com/word/ack},
  urldate = {2026-11-06}
}