incognito
Concise Oxford English Dictionary © 2008 Oxford University Press:
incognito /ˌɪnkɒgˈniːtəʊ/, /ɪnˈkɒgnɪtəʊ/
▶adjective & adverb having one's true identity concealed. ▶noun (pl. incognitos) an assumed or false identity.
– origin C17: from Ital., lit. ‘unknown’.
'incognito' also found in these Oxford entries:

