#1 acknowledge v. [admit] declare to be true or admit the existence or reality or truth of; "He admitted his errors"; "She acknowledged that she might have forgotten". wn
#2 acknowledge v. [receipt] report the receipt of; "The program committee acknowledged the submission of the authors of the paper". wn
#3 acknowledge v. [notice] 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. wn
#4 acknowledge v. [recognize, recognise] express obligation, thanks, or gratitude for; "We must acknowledge the kindness she showed towards us". wn
#5 acknowledge v. accept as legally binding and valid; "acknowledge the deed". wn
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