commilitare

commilitare , to fight (in alliance) with. b to serve (as a knight). s1189 indigene quam plurimi [Hungarie] ‥ vident aciem sanctam et ~are gestiunt Itin. Ric. I 20. b sive in curia sua ~are sive regie dignitati disposuisset obsistere G. Steph. I 21.