eighteenth

[adj] - coming next after the seventeenth in position 2. [n] - position 18 in a countable series of things
Found on http://www.webdictionary.co.uk/definition.php?query=eighteenth

Eighteenth

• (a.) Consisting of one of eighteen equal parts or divisions of a thing. • (a.) Next in order after the seventeenth. • (n.) The eighth after the tenth. • (n.) The quotient of a unit divided by eighteen; one of eighteen equal parts or divisions.
Found on http://thinkexist.com/dictionary/meaning/eighteenth/

eighteenth

18th adjective coming next after the seventeenth in position
Found on http://wordnetweb.princeton.edu/perl/webwn?s=eighteenth

Eighteenth

Eight'eenth` adjective [ From Eighteen .] 1. Next in order after the seventeenth. 2. Consisting of one of eighteen equal parts or divisions of a thing.
Found on http://www.encyclo.co.uk/webster/E/14
No exact match found