Vacavillian adjective 1noun 1forms 3 adjective1 •Of or pertaining to the city of Vacaville, California, United States.Waterman had hidden his beloved Maiden Cordelia in the 50-foot octagonal tower there to keep her from falling into the hands of Vacavillian brutes. — 2013 noun1 •A native or resident of the city of Vacaville, California, United States.“I am a fruit rancher and fourth-generation Vacavillian. […] — 1999 formsVacavillians · more Vacavillian · most Vacavillian