1. of or relating to the tenth; occurring every tenth time or in every tenth instance
Usage: archaic; rare
2. of enormous size; huge or gigantic
Usage: archaic; literary

Examples

• The decuman wave crashed against the shore with tremendous force.
• Ancient texts describe decuman losses in the tenth year of the war.
• The decuman proportions of the cathedral left visitors in awe.
• A decuman task lay before the explorers as they ventured into unknown territory.