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express recognition of the presence or existence of, or acquaintance with; "He never acknowledges his colleagues when they run into him in the hallway"; "She acknowledged his complement with a smile"; "it is important to acknowledge the work of others in one's own writing"
a request for payment; "the notification stated the grace period and the penalties for defaulting"
notice or perceive; "She noted that someone was following her"; "mark my words"
advance notification (usually written) of the intention to withdraw from an arrangement of contract; "we received a notice to vacate the premises"; "he gave notice two months before he moved"
discover or determine the existence, presence, or fact of; "
the act of noticing or paying attention; "he escaped the notice of the police"
polite or favorable attention; "his hard work soon attracted the teacher's notice"
a short critical review; "the play received good notices"