EIGHTEENTH
eighteenth, th
(adjective) coming next after the seventeenth in position
eighteenth
(noun) position 18 in a countable series of things
Source: WordNet® 3.1
Adjective
eighteenth
The ordinal form of the number eighteen.
Abbreviations
• 18th, 18th, XVIIIth; (in royal, papal and other names; for centuries) XVIII
Noun
eighteenth (plural eighteenths)
The person or thing in the eighteenth position.
One of eighteen equal parts of a whole.
(informal) A party to celebrate an eighteenth birthday.
Synonyms
• 18th
• XVIIIth
Source: Wiktionary
Eight"eenth`, a. Etym: [From Eighteen.]
1. Next in order after the seventeenth.
2. Consisting of one of eighteen equal parts or divisions of a thing.
Eight"eenth`, n.
1. The quotient of a unit divided by eighteen; one of eighteen equal
parts or divisions.
2. The eighth after the tenth.
Source: Webster’s Unabridged Dictionary 1913 Edition