/ ˌɪnkɒgˈniːtəʊ; NAmE ˌɪnkɑːgˈniːtoʊ/ adverb
in a way that prevents other people from finding out who you are :
Movie stars often prefer to travel incognito.
► in·cog·nito adjective :
an incognito visit
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WORD ORIGIN
mid 17th cent.: from Italian , literally unknown , from Latin incognitus , from in- not + cognitus (past participle of cognoscere know).