Nine"teenth` (?), a. [Cf. AS.
nigonteó&?;a.] 1. Following the
eighteenth and preceding the twentieth; coming after eighteen
others.
2. Constituting or being one of nineteen
equal parts into which anything is divided.
Nine"teenth`, n. 1.
The quotient of a unit divided by nineteen; one of nineteen
equal parts of anything.
2. The next in order after the
eighteenth.
3. (Mus.) An interval of two octaves
and a fifth.