• (n.) A set or squad of ten men under a decurion.
Dec'u·ry noun ; plural Decuries . [ Latin decuria , from decem ten.] A set or squad of ten men under a decurion. Sir W. Raleigh. 
decury In ancient Rome, a unit of ten soldiers. Related 'metric' families: yotta; zetta; exa; peta; tera; giga; mega; kilo; hecto; deka; centi; milli; micro; nano; pico; femto; atto; zepto; yocto.
a division, company, or body of ten men. · any larger body of men, esp. the curiae.