acknowledge in WordNet English dictionary

1. accept as legally binding and valid
   "acknowledge the deed"
   acknowledge 
   
2. accept (someone) to be what is claimed or accept his power and authority
   "The Crown Prince was acknowledged as the true heir to the throne"; "We do not recognize your gods"
   acknowledge  recognize  recognise  know 
   
3. declare to be true or admit the existence or reality or truth of
   "He admitted his errors"; "She acknowledged that she might have forgotten"
   admit  acknowledge 
   
4. express obligation, thanks, or gratitude for
   "We must acknowledge the kindness she showed towards us"
   acknowledge  recognize  recognise 
   
5. report the receipt of
   "The program committee acknowledged the submission of the authors of the paper"
   acknowledge  receipt 
   
6. 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"
   notice  acknowledge