a. [ From Sixteen: cf. AS. sixteó&unr_;a. ] 1. Sixth after the tenth; next in order after the fifteenth. [ 1913 Webster ]
2. Constituting or being one of sixteen equal parts into which anything is divided. [ 1913 Webster ]
Sixteenth note (Mus.), the sixteenth part of a whole note; a semiquaver. [ 1913 Webster ]
n. 1. The quotient of a unit divided by sixteen; one of sixteen equal parts of one whole. [ 1913 Webster ]
2. The next in order after the fifteenth; the sixth after the tenth. [ 1913 Webster ]
3. (Mus.) An interval comprising two octaves and a second. Moore (Encyc. of Music.) [ 1913 Webster ]