the world > relative properties > number > specific numbers > eleven to ninety-nine > [adverb] > eighteenthly
eighteenthlya1643
a1643 W. MonsonNaval Tractsiii, in A. Churchill & J. Churchill Coll. Voy. (1704) III. 322/2Eighteenthly, That One of the Three Officers do..reside at Chatham.
1681 H. MorePlain Expos. Daniel App. iii. 303Eighteenthly, why..should the name..be said to be written?