quantity: P. and V. πλῆθος, τό.
size: P. and V. μέγεθος, τό.
number: P. and V. ἄριθρος, ὁ, V. ἀρίθμημα, τό.
sum (of money): P. δύναμις, ἡ.
the whole amount: P. and V. τὸ σύμπαν.
what amount of, how much, interrogative: P. and V. πόσος; indirect P. and V. ὅποσος.