ack

Etymology 1
.

Noun

 * 1)  The letter A as used in signalling and other types of communications.
 * 2)  acknowledgment signal
 * 1)  acknowledgment signal

Alternative forms

 * ACK

Antonyms

 * nack, nak

Derived terms

 * ack emma
 * ack-ack

Interjection

 * 1)  acknowledged

Etymology 2
Imitative.

Interjection

 * 1) Expressing distaste, alarm, or trepidation.

Etymology
From, from , from , plural of.

Noun

 * 1) act

Verb

 * 1) to act

Etymology 1
From, from.

Interjection

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

Etymology 2
.

Noun

 * 1)  an electric accumulator.