Definitions for: Eighteenth

[n] position 18 in a countable series of things
[adj] coming next after the seventeenth in position

Webster (1913) Definition: Eight"eenth`, a. [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.

Synonyms: 18th, ordinal

See Also: rank