Etymology
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detect (v.)

early 15c., "uncover, lay bare, expose, disclose, reveal," a sense now obsolete, from Latin detectus, past participle of detegere "uncover, expose," figuratively "discover, reveal, disclose," from de "un-, off" (see de-) + tegere "to cover," from PIE root *(s)teg- "to cover."

Sense of "to find out the secret action or character of" is from 1580s. Meaning "discover, find out, ascertain" is from 1756. Related: Detected; detecting.

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Definitions of detect

detect (v.)
discover or determine the existence, presence, or fact of;
She detected high levels of lead in her drinking water
Synonyms: observe / find / discover / notice
From wordnet.princeton.edu