Search Result for "concentricity": 
Wordnet 3.0

NOUN (1)

1. the quality of having the same center (as circles inside one another); 



The Collaborative International Dictionary of English v.0.48:

Concentricity \Con`cen*tric"i*ty\, n.
   The state of being concentric.
   [1913 Webster]


WordNet (r) 3.0 (2006):

concentricity
    n 1: the quality of having the same center (as circles inside
         one another) [ant: eccentricity]