A specified or definite amount of an article or commodity; a (large, small, etc.) portion or measure; also without of-adjunct. Also (occasionally)…

Magnitude or quantity as ascertained by measuring. With preceding distinguishing adjective (as full, good, etc.): an ample or generous quantity…

A definite quantity or amount (of). Obsolete.

A certain or definite number or quantity. Obsolete.

An assigned measure, a definite amount. Obsolete.

= dose, n. (being the form in earlier use in English).

transferred and figurative. A definite quantity or amount of something regarded as analogous in some respect to a medical prescription, or to…

With modifying adjective, usually small: a (certain) quantity or amount (of). Obsolete.

A specified or definite amount or quantity; = quantity, n. 1a.

Chemistry. A determinate quantity or amount, in terms of bulk, of any substance.