What does aggregate mean?
The definition of aggregate
Ag”gre*gate, a. [L. aggregatus, p. p.]
1 Formed by a collection of particulars into a whole mass or sum; collective.
The aggregate testimony of many hundreds. Sir T. Browne.
2 (Anat.) Formed into clusters or groups of lobules; as, aggregate glands.
3 (Bot.) Composed of several florets within a common involucre, as in the daisy; or of several carpels formed from one flower, as in the raspberry.
4 (Min. & Geol.) Having the several component parts adherent to each other only to such a degree as to be separable by mechanical means.
5 (Zoöl.) United into a common organized mass; — said of certain compound animals.
Corporation aggregate. (Law) See under Corporation.

Ag”gre*gate, v. t.
[imp. & p. p. Aggregated; p. pr. & vb. n. Aggregating.] [L. aggregatus, p. p. of aggregare to lead to a flock or herd; ad + gregare to collect into a flock, grex flock, herd. See Gregarious.]

1 To bring together; to collect into a mass or sum. “The aggregated soil.” Milton.
2 To add or unite, as, a person, to an association.
It is many times hard to discern to which of the two sorts, the good or the bad, a man ought to be aggregated. Wollaston.
3 To amount in the aggregate to; as, ten loads, aggregating five hundred bushels. [Colloq.]
Syn. — To heap up; accumulate; pile; collect.

Ag”gre*gate, n.
1 A mass, assemblage, or sum of particulars; as, a house is an aggregate of stone, brick, timber, etc.
In an aggregate the particulars are less intimately mixed than in a compound.
2 (Physics) A mass formed by the union of homogeneous particles; — in distinction from a compound, formed by the union of heterogeneous particles.
In the aggregate, collectively; together.