† preˈsumptorily,adv.Obs.rare—1. [f. late L. præsumptōriēadv., from præsumptōriusadj. (rare), presumptuous: see -ory2 and -ly2.] = presumptuously. 1681in Savile Corr. (Camden) 234, I durst not presumptorily undertake..that whatever stock of that kind [tin at Marseilles] they should carry over should bee safe.