What dose it mean????

No idea

Unequal jazz.

(Facetious, moi?)

I actually just did a google, and I think it *might* be the French term for swing??! But I am not sure, sorry.

I found it in Medieval Nights by pete rose for tenor recorder

Have you tried googling yourself for it? The Dolmetsch site gives some information, and there are various other sites as well which you could have look at.

I think its where you swing notes of the same length to give but keeping within the time that the 2 notes occupy, like rubato, you spend more time in some places and compensate by shortening others.

I think it means sort of swinging the quavers (written as straight) in jazz.