What is Detectable?

Detectable definition and meaning on Dictionary terms:
verb (used with object)
to discover or catch (a person) in the performance of some act: to detect someone cheating.
to discover the existence of: to detect the odor of gas.
to find out the true character or activity of: to detect a spy.
Telecommunications. to rectify alternating signal currents in a radio receiver. to demodulate.