in ‧ cog ‧ ni ‧ to /ˌɪnkɒɡˈniːtəʊ $ ˌɪnkɑːɡˈniːtoʊ/ BrE AmE adverb
[ Date: 1600-1700 ; Language: Italian ; Origin: Latin incognitus 'unknown' ]
if a famous person does something incognito, they do it without letting people know who they are ⇨ disguise :
That night, Lenin travelled incognito to the party headquarters.