ADJECTIVE (1)

1. with your identity concealed;


ADVERB (1)

1. without revealing one's identity;
- Example: "in Holland he lived incognito as a carpenter in the shipyards of the East India company"

The Collaborative International Dictionary of English v.0.48:

Incognito \In*cog"ni*to\, a. or adv. [It. incognito, masc.,
   incognita, fem., L. incognitus unknown; pref. in- not +
   cognitus known, p. p. of cognoscere: cf. F. incognito, fr.
   It. See Cognition.]
   Without being known; in disguise; in an assumed character, or
   under an assumed title; -- said esp. of great personages who
   sometimes adopt a disguise or an assumed character in order
   to avoid notice.
   [1913 Webster]

         'T was long ago
         Since gods come down incognito.          --Prior.
   [1913 Webster]

         The prince royal of Persia came thither incognito.
                                                  --Tatler.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Incognito \In*cog"ni*to\, n.; pl. Incognitos. [See
   Incognito, a.]
   [1913 Webster]
   1. One unknown or in disguise, or under an assumed character
      or name.
      [1913 Webster]

   2. The assumption of disguise or of a feigned character; the
      state of being in disguise or not recognized.
      [1913 Webster]

            His incognito was endangered.         --Sir W.
                                                  Scott.
      [1913 Webster]

WordNet (r) 3.0 (2006):

incognito
    adv 1: without revealing one's identity; "in Holland he lived
           incognito as a carpenter in the shipyards of the East
           India company"
    adj 1: with your identity concealed