simple past tense and past participle of detect
"The security guard detected a suspicious package under the passenger's coat before the train departed."
In plain English: Detected means you found something that was hidden or not obvious at first.
"The security guard detected a person hiding in the shadows."
Usage: Use detected to indicate that someone or something noticed the presence of another person, object, or fact through observation or investigation. It functions as both the simple past tense and the past participle of detect in sentences describing successful discovery.
Having been noticed.
"The security guard detected a suspicious package on the floor before anyone else arrived."
In plain English: Detected means something was found or noticed by someone.
"The security guard detected suspicious activity immediately."
Usage: The word "detected" is strictly a verb form and cannot function as an adjective; therefore, it should never be used to describe a noun directly. Instead, use the adjective "detected" only after a linking verb like "was" to indicate that something has been noticed, such as in "a detected signal."
Derived from Old French detecter, which came from Latin dētectus (past participle of dētegere), meaning "to uncover" or "to reveal." The original sense referred to stripping away a covering, later evolving to mean discovering something hidden.