EIGHTEEN
eighteen, xviii
(adjective) being one more than seventeen
eighteen, XVIII
(noun) the cardinal number that is the sum of seventeen and one
Source: WordNet® 3.1
Etymology
Numeral
eighteen
The cardinal number occurring after seventeen and before nineteen, represented in Roman numerals as XVIII and in Arabic numerals as 18.
Etymology
Derived from place names such as Ayton, Eaton, and Eton.
Proper noun
Eighteen
A surname.
Source: Wiktionary
Eight"een`, a. Etym: [AS. eahtat, eahtat. See Eight, and Ten, and cf.
Eighty.]
Definition: Eight and ten; as, eighteen pounds.
Eight"een`, n.
1. The number greater by a unit than seventeen; eighteen units or
objects.
2. A symbol denoting eighteen units, as 18 or xviii.
Source: Webster’s Unabridged Dictionary 1913 Edition