Maximum amount; (also) huge size or extent.

The highest possible magnitude or quantity of something which is attained, attainable, or customary; an upper limit of magnitude or quantity…

colloquial. The upper limit, esp. of an estimate; the fullest or highest degree or quantity, the utmost. Chiefly in at the outside: at the most.

gen. The maximum amount. Frequently in to the max: to the highest degree possible; to the limit; totally.

Chiefly Mathematics. Any number or magnitude such that either none of a specified set of numbers exceeds it, or none is less than it; an upper or…

An upper limit (to quantity, prices, expenditure, etc.); a maximum. Also attributive. Cf. floor, n.1 1c.

Of prices, expenditure, etc.: = ceiling, n. 6d. Cf. earlier roofless, adj. 4.