The Collaborative International Dictionary of English v.0.48:

Contemporaneity \Con*tem`po*ra*ne"i*ty\, n.
   The state of being contemporaneous.
   [1913 Webster]

         The lines of contemporaneity in the oolitic system.
                                                  --J. Philips.
   [1913 Webster]

WordNet (r) 3.0 (2006):

contemporaneity
    n 1: the quality of being current or of the present; "a shopping
         mall would instill a spirit of modernity into this village"
         [syn: modernity, modernness, modernism,
         contemporaneity, contemporaneousness]
    2: the quality of belonging to the same period of time [syn:
       contemporaneity, contemporaneousness]