Lewis Short
dĕcĭmātĭo (noun F) : decimo
* The taking of a tenth.
* A tithing: omnis,Vulg. Tobiae, 1, 7.
* A selecting by lot of every tenth man for punishment, decimation, Capitol. Macr. 12.
* A tenth: adhuc in ea decimatio,Vulg. Isa. 6, 13.
Charlton T. Lewis, Charles Short, A Latin Dictionary