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

NINETEENTH
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.)

Defn: An interval of two octaves and a fifth.

NINETIETH
Nine"ti*eth, a.

1. Next in order after the eighty-ninth.

2. Constituting or being one of ninety equal parts.

NINETIETH
Nine"ti*eth, n.