1. (a.) Following the eighteenth and preceding the twentieth; coming after eighteen others.

2. (a.) Constituting or being one of nineteen equal parts into which anything is divided.

3. (n.) The quotient of a unit divided by nineteen; one of nineteen equal parts of anything.

4. (n.) The next in order after the eighteenth.

5. (n.) An interval of two octaves and a fifth.