In‐cog″ni‐to (?), a. or adv. [It. incognito, masc., incognita, fem., L. incognitus unknown; pref. in- not + cognitus known, p. p. of cognoscere: cf. F. incognito, fr. It. See Cognition.] Without being known; in disguise; in an assumed character, or under an assumed title; — said esp. of great personages who sometimes adopt a disguise or an assumed character in order to avoid notice.
'T was long ago
Since gods come down incognito. Prior.
The prince royal of Persia came thither incognito. Tatler.