Here are the possible solutions for greatest possible quantity clue
Answer
Clue
Relevancy
maximum
Clue
Greatest possible quantity
Definition
(Latin) greatest
devo
Clue
Band that simultaneously released the albums "Greatest Hits" and "Greatest Misses"
Definition
(short for) devolution, as in devo max, an arrangement in which a central government transfers the maximum amount of authority to a regional government while still retaining sovereignty over it
woman
Clue
The "greatest blessing" and the "greatest plague": Euripides
most
Clue
Greatest quantity
Greatest quantity?
Definition
in the highest degree
any
Clue
Quantity that makes another quantity by adding an "m" at the front