English

Noun

ack ‎(plural acks)

1. (military, now historical) The letter A as used in signalling and other types of communications.
   • 1929, Frederic Manning, The Middle Parts of Fortune, Vintage 2014, p. 173:

     They had to begin at the beginning: learning the Morse code, flag-wagging, a succession of acks, and practice on the buzzer.

2. (data communications) acknowledgment signal

Derived terms

• ack emma

Alternative forms

• (data communications): ACK

Antonyms

• (data communications): nack, nak

Interjection

ack

1. (radio communications) acknowledged

Derived terms

• ack-ack

Anagrams

• AKC

Etymology 2

Imitative.

Interjection

ack

1. Expressing distaste, alarm, or trepidation.

Swedish

Etymology

From Old Swedish akh, from Middle Low German ach ‎(“an unhappy interjection”).

Pronunciation

Interjection

ack

1. alas, oh (exclamation of sorrow, etc.)

See also

• eja

Noun

ack c

1. (electronics, slang) an electric accumulator; Contraction of ackumulator.

Declension