Definitions
1.verbTo admit the knowledge of; to recognize as a fact or truth; to declare one's belief in"to acknowledge the being of a god"
2.verbTo own or recognize in a particular quality, character or relationship; to admit the claims or authority of; to give recognition to.
3.verbTo be grateful of (e.g. a benefit or a favour)"to acknowledge a favor"
4.verbTo report (the receipt of a message to its sender)."This is to acknowledge your kind invitation to participate in the upcoming debate."
5.verbTo own as genuine or valid; to assent to (a legal instrument) to give it validity; to avow or admit in legal form.
6.adjectiveGenerally accepted, recognized or admitted.