ack

Noun (1)

ack (plural acks)

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.1929, Frederic Manning, The Middle Parts of Fortune, Vintage, published 2014, page 173
2. (data communications) acknowledgment signal

Interjection (1)

1. acknowledged

Interjection (2)

IPA/æ(ː)k/

1. Expressing distaste, alarm, or trepidation.
2. (offensive, 4chan slang) 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!2021 September 22, anonymous author, 4chan, /qa/
   • >...ACK!2021 September 23, anonymous author, 4chan, /qa/

Verb (1)

IPA/æ(ː)k/

ack (third-person singular simple present acks, present participle acking, simple past and past participle acked)

1. (offensive, reflexive, 4chan slang) To commit suicide.
   • Ack yourself.

Noun (2) capitalized: ACK

ACK (plural ACKs)

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

Verb (2) capitalized: ACK

ACK (third-person singular simple present ACKs, present participle ACKing, simple past and past participle ACKed)

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.2005, Michael Welzl, Network Congestion Control: Managing Internet Traffic, page 150