This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. The act of acknowledging; admission; avowal; owning; confession.

n. The act of owning or recognizing in a particular character or relationship; recognition as regards the existence, authority, truth, or genuineness.

n. An award or other expression or token of appreciation.

n. An expression of gratitude.

n. A message from the addressee informing the originator that the originator's communication has been received and understood.

n. A response sent by a receiver to indicate successful receipt of a transmission.

n. The act of a man admitting a child as his own.

n. A formal statement or document recognizing the fulfilment or execution of a legal requirement or procedure.

n. See acknowledgment.

n. the state or quality of being recognized or acknowledged

n. a statement acknowledging something or someone

"But ministers should realise that it will take far more than the government's own political priorities to deliver success ... and a word of acknowledgement wouldn't go amiss."

acceptance   

acknowledgment money   

admission    avowal    owning    confession    profession    declaration    concession    recognition    recognizance    ACK   

acknowledgement   

recognition    acknowledgement    acceptance    greet    assent    apology    submission    admission    homage    confession