a. [ AS. nigont&ymacr_;ne, nigontēne. See Nine, and Ten. ] Nine and ten; eighteen and one more; one less than twenty; as, nineteen months. [ 1913 Webster ]
n. 1. The number greater than eighteen by a unit; the sum of ten and nine; nineteen units or objects. [ 1913 Webster ]
2. A symbol for nineteen units, as 19 or xix. [ 1913 Webster ]
a. [ Cf. AS. nigonteóða. ] 1. Following the eighteenth and preceding the twentieth; coming after eighteen others. [ 1913 Webster ]
2. Constituting or being one of nineteen equal parts into which anything is divided. [ 1913 Webster ]
n. 1. The quotient of a unit divided by nineteen; one of nineteen equal parts of anything. [ 1913 Webster ]
2. The next in order after the eighteenth. [ 1913 Webster ]
3. (Mus.) An interval of two octaves and a fifth. [ 1913 Webster ]