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Latin word decumanus comes from Latin decima (Tenth hour. Tenth part. Tithe.), Latin -anus
decima (Latin)
Tenth hour. Tenth part. Tithe.
-anus (Latin)
Of or pertaining to; -ian; usually indicates a relationship of position, possession, or origin.
decumanus (Latin)
Concerned with or relating to the tenth cohort or legion. Concerned with or relating to tithes or the collection of tithes. Tenth (attributive: "of the tenth") A tithe farmer or collector.