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.
source: Webster 1913
noun
One unknown or in disguise, or under an assumed character or name.
source: Webster 1913
adverb
without revealing one's identity
In Holland he lived incognito as a carpenter in the shipyards of the East India company.
