NOUN (1)

1. an insignificant place;
- Example: "he came out of nowhere"


ADVERB (1)

1. not anywhere; in or at or to no place;
- Example: "I am going nowhere"

The Collaborative International Dictionary of English v.0.48:

Nowhere \No"where`\, adv. [AS. n[=a]hw[=ae]r. See No, and
   Where.]
   Not anywhere; not in any place or state; as, the book is
   nowhere to be found.
   [1913 Webster]

WordNet (r) 3.0 (2006):

nowhere
    adv 1: not anywhere; in or at or to no place; "I am going
           nowhere"
    n 1: an insignificant place; "he came out of nowhere"