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incognito

adjective

having one’s identity concealed, as under an assumed name, especially to avoid notice or formal attentions.

adverb

with the real identity concealed: to travel incognito.

noun, plural in·cog·ni·tos for 3, 5.

a person who is incognito.
the state of being incognito.
the disguise or character assumed by an incognito.

adverb, adjective (postpositive)

under an assumed name or appearance; in disguise

noun plural -tos

a person who is incognito
the assumed name or disguise of such a person

adj./adv.

1640s, from Italian incognito “unknown,” especially in connection with traveling, from Latin incognitus “unknown,” from in- “not, opposite of, without” (see in- (1)) + cognitus, past participle of cognoscere “to get to know” (see cognizance). Fem. form incognita was maintained through 19c. by those scrupulous about Latin. Incog was a common 18c. colloquial abbreviation.