adv. [f. prec. + -LY2.] Of ones own accord; spontaneously, voluntarily.
1627. W. Sclater, Exp. 2 Thess. (1629), 75. Is it warrantable vltroneously to offer our selues to Martyrdome?
1657. Reeve, Gods Plea, 28. He [God] doth love himselfe necessarily, but all other things ultroneously.
1847. Sir W. Hamilton, Lett. to De Morgan, 30. In the second, (what you omit to mention) copies were through your friend Dr. ultroneously proffered.
1883. Saturday Review, 21 July, 65. Mr. Gladstone and his colleagues wantonly, ultroneously, have themselves interpreted and settled a complicated point.