The Collaborative International Dictionary
Decertation
Decertation \De`cer*ta"tion\, n. [L. decertatio, fr. decertare,
decertatum; de- + certare to contend.]
Contest for mastery; contention; strife. [R.]
--Arnway.
Wiktionary
decertation
n. (cx obsolete English) contest for mastery; contention; strife