a. Forms (see EIGHT) + 1 -tuða, -teða, téoða (fem. neut. -ðe), 3 -teþe, -tenthe, 4 -teoþe, 6 -tenth, 6– -teenth; from 6– the t of eight has been dropped, though some dialects still retain it in pronunciation. [OE. eahtatéoða, f. eahta, EIGHT + téoða tenth; cf. ON. áttjándi; in the other OldTeut. langs. this numeral is not recorded. The mod. form is f. EIGHTEEN + -TH (after FOURTH) which has become the ordinal suffix for all numerals above 3.]
Next in order after the seventeenth. Hence Eighteenthly adv., in the eighteenth place.
c. 893. K. Ælfred, Oros., VI. ii. § 3. On þæm eahteteoþan ʓeare his [Tiberius’] rices … wearð micel þeosternes ofer eallne middangeard.
1258. Procl. Hen. III. (ed. Ellis, 1868). Witnesse vs seluen æt Lundæn þane eȝtetenþe day on the Monþe of Octobr.
1297. R. Glouc. (1810), 436. Þo deyde Mold þys god quene, enlene hondred ȝer And eyȝteþe after þat God anerþe alyȝte her.
c. 1305. St. Swithin, 5, in E. E. P. (1862), 43. Þe eiȝteteoþe king.
1530. Palsgr., 372. Dixhuitiesme, eyghtenth.
1579. Fulke, Heskins’ Parl., 192. The eighteenth Chapter beginneth the exposition.
1611. Bible, 1 Kings xv. 1. In the eighteenth yeere of king Ieroboam.
1872. Morley, Voltaire (1886), 4. Voltairism may stand for the name of the Renaissance of the eighteenth century.
1642. Sir W. Monson, Naval Tracts, III. (1704), 322/2. Eighteenthly, That One of the Three Officers do reside at Chatham.
1681. H. More, Expos. Daniel, App. iii. 303. Eighteenthly, Why … should the name … be said to be written?
