Nouns

(n)detection, sensingthe perception that something has occurred or some state exists“early detection can often lead to a cure”
(n)detection, catching, espial, spying, spottingthe act of detecting something; catching sight of something
(n)signal detection, detectionthe detection that a signal is being received
(n)detection, detecting, detective work, sleuthinga police investigation to determine the perpetrator“detection is hard on the feet”