· discover or determine the existence, presence, or fact of; "She detected high levels of lead in her drinking water"; "We found traces of lead in the paint"

Synonym(s): detect, observe, find, discover

Hypernym(s): spy, sight

· notice or perceive; "She noted that someone was following her"; "mark my words"

Synonym(s): mark, note

Antonym(s): ignore

· make or write a comment on; "he commented the paper of his colleague"

Synonym(s): comment, remark, point_out

Hypernym(s): note, observe, mention, remark

· 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"

Synonym(s): acknowledge

Hypernym(s): react, respond

· being perceived or observed; "an easily noticed effect on the rate of growth"

Antonym(s): unnoticed