Etymology
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incognito (adj./adv.)

1640s as both adjective ("disguised under an assumed name and character") and adverb ("unknown, with concealed identity"), from Italian incognito "unknown," especially in connection with traveling, from Latin incognitus "unknown, not investigated," from in- "not, opposite of, without" (see in- (1)) + cognitus, past participle of cognoscere "to get to know" (see cognizance). Also as a noun, "an unknown man" (1630s). Feminine form incognita was maintained through 19c. by those scrupulous about Latin. Incog was a common 18c. colloquial abbreviation.

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Definitions of incognito
1
incognito (adv.)
without revealing one's identity;
in Holland he lived incognito as a carpenter in the shipyards of the East India company
2
incognito (adj.)
with your identity concealed;
From wordnet.princeton.edu