detection

(noun) the perception that something has occurred or some state exists. Synonyms: sensing. Example: "Early detection can often lead to a cure."

(noun) the act of detecting something; catching sight of something. Synonyms: catching, espial, spying, spotting.

(noun) the detection that a signal is being received. Synonyms: signal detection.

(noun) a police investigation to determine the perpetrator. Synonyms: detecting, detective work, sleuthing. Example: "Detection is hard on the feet."