The Collaborative International Dictionary of English v.0.48:

Centare \Cen"tare`\, n. [F. centiare; centi- (L. centum) +
   -are.]
   A measure of area, the hundredth part of an are; one square
   meter, or about 11/5 square yards.
   [1913 Webster]

WordNet (r) 3.0 (2006):

centare
    n 1: a centare is 1/100th of an are [syn: square meter,
         square metre, centare]