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discover or determine the existence, presence, or fact of; "
make or write a comment on; "he commented the paper of his colleague"
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 or perceive; "She noted that someone was following her"; "mark my words"
being perceived or observed; "an easily noticed effect on the rate of growth"