(logic) An argument's property of being valid due to being an instance of an argument form.

plural of face validity

plural of formal validity

plural of valide sultan

plural of valide trombone

(historical) The mother (or in special cases, the sister, grandmother, or stepmother) of a reigning sultan of the Ottoman Empire

A hybrid trombone having both a set of three piston valves and a slide to vary the pitch, the slide being positioned within the valve section and shorter than a standard trombone slide, only covering four positions instead of the usual seven, and not locking.