The Collaborative International Dictionary
Fecial
Fecial \Fe"cial\, a. [L. fetialis belonging to the fetiales, the
Roman priests who sanctioned treaties and demanded
satisfaction from the enemy before a formal declaration of
war.]
Pertaining to heralds, declarations of war, and treaties of
peace; as, fecial law.
--Kent.
Wiktionary
fecial
a. Relating to heralds, declarations of war, and peace treaty.