diapason /dī-ə-pāˈzən, -sən/ (music)

1. A full volume of various sounds in concord
2. The whole range or compass of tones
3. A standard of pitch
4. A whole octave (obsolete)
5. A bass part (obsolete)
6. Harmony (obsolete)
7. A foundation-stop of an organ (open or stopped diapason) extending through its whole range

• notionalist
• notionalists
• notionally
• notionist
• notionists
• notions
• notitia
• notitiae
• notitias
• not know a B from a battledore
• not know a B from a broomstick
• not know a B from a bull's foot
• not know chalk from cheese
• not know if one is coming or going
• not know one's arse from one's elbow
• not know someone from Adam
• not know the first thing about
• not lift a finger
• not likely
• not long for this world
• not make head or tail of
• not much chop
• not much cop
• not much of a
• not much to choose between