the mental faculties; intelligence or quickness of mind (usually used in plural).

知力・機転・頭の回転（通常は複数形で使う）

one's presence of mind or ability to think clearly in a particular situation (e.g., 'have your wits about you').

その場で冷静に考える能力・用心深さ（例：have your wits about you）

third-person singular present of the archaic verb 'wit' meaning 'to know' or 'to perceive' (rare/archaic).

古語の動詞 'wit'（知る・知覚する）の三人称単数現在（稀・古語）