-acious|-ˈeɪʃəs|compd. suffix, formingadjs.meaning ‘given to, inclined to, abounding in’;f.L. -āci- (nom.-ax),adj.ending added chiefly tovb.stems (Fr.-ace) + -ous; as L. vīv-ere to live, vīvāci- lively (Fr.vivace),Eng.vivaci-ous; so mendacious, voracious, fallacious, capacious. Henceadv.in -aciously;ns.of quality in -acious-ness, -acity;vbs.in -acitate.