To discover or ascertain the existence, presence, or fact of.
To discern (something hidden or subtle): detected a note of sarcasm in the remark.
To learn something hidden and often improper about: detected the manager in a lie.
Electronics To demodulate.
[Middle English detecten, from Latin dētegere, dētēct-, to uncover : dē-, de- + tegere, to cover; see (s)teg- in Indo-European roots.] de·tect'a·ble, de·tect'i·ble adj., de·tect'er n.