early 15c., "accusation," from Late Latin detectionem (nominative detectio) "an uncovering, a revealing," noun of action from past-participle stem of detegere "uncover, expose," figuratively "discover, reveal, disclose," from de "un-, off" (see de-) + tegere "to cover," from PIE root *(s)teg- "to cover." From 1610s as "discovery, finding by search or observation," especially "act of finding out and bringing to light."
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