Answer:

sevenths

Answer	Crossword Clue
SEVENTHS	Intervals less than octaves
SEVENTHS	They're not quite octaves
SEVENTHS	Fractions.

SEVENTHS	Musical intervals
SEVENTHS	Some are dominant
SEVENTHS	Additions to triads

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.