interjection

ACK

ACK (interjection) means used to express disgust, alarm, or annoyance. Example: “Ack, I forgot my keys again!”

interjection

Used to express disgust, alarm, or annoyance.

"Ack, I forgot my keys again!"

noun

In computing, a short signal confirming that data was received.

"The server sent an ack back to confirm the file had arrived."

How to Use ACK

Learner’s notes

In plain EnglishEither a casual sound of disgust, or (in tech) shorthand for a confirmation signal.

When to use it

The technical sense is common in networking and programming contexts; the interjection is informal.

Word Forms

ACKed past tense, acked past tense, ACKs plural, acks plural, ACKs singular, acks singular

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Fill the Gap

Can you complete this real example?

_____, I forgot my keys again!

Etymology

Shortened from "acknowledged," originally used in telegraph and radio signalling.

Antonyms

NAK nack

Related Words

NAK

Rhymes for ACK

jack hack back tack wack pack sack rack lack Mack Zack aback

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Frequently Asked Questions

What does “ACK” mean?

The word “ACK” means used to express disgust, alarm, or annoyance. In plain terms, either a casual sound of disgust, or (in tech) shorthand for a confirmation signal.

How do you pronounce “ACK”?

“ACK” is pronounced ak (/æk/ in IPA).

How do you use “ACK” in a sentence?

Here is “ACK” used in a sentence: “Ack, I forgot my keys again!”

What is the opposite of “ACK”?

The opposite of “ACK” — its antonyms — are NAK and nack.

What part of speech is “ACK”?

Depending on how it is used, “ACK” can be an interjection and a noun.

How many meanings does “ACK” have?

“ACK” has 2 distinct senses listed in this dictionary. The most common is: used to express disgust, alarm, or annoyance.

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