1) Area unit 2) Square measure 3) Square meter 4) Square metre 
• (n.) A measure of area, the hundredth part of an are; one square meter, or about 1/ square yards.
Cen'tare` noun [ French centiare ; centi- (L. centum ) + -are .] A measure of area, the hundredth part of an are; one square meter, or about 1⅕ square yards. 
centare, centiare A measure of area, the hundredth part of an are; one square meter. An are is a metric unit of area equal to 100 square meters (119.6 square yards).