To spot, detect, recognize, capture, or see something or someone having been unknown, invisible, obscured, too distant, or otherwise not found before.
To see, discover or determine something, unclear, distant or hidden, by looking carefully.
determine the existence of; "We detected traces of the poison in her food"
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"
discover or determine the existence, presence, or fact of
