Aggregate can be either a verb, a noun or an adjective.
As a verb, it means bring together into a group or mass. For example, you might aggregate a bunch of stamps you’ve gathered from a variety of places into a stamp collection.
Oh, come on. Stamps. You remember those. The post office sold them.
Oh, come on. You remember the Post Office. It was a government-owned company or agency that we used to use to communicate with one another back in the days when paper was the primary form of communication.
Oh, come on. You remember paper. It was … Oh, never mind.
As a verb, aggregate can also mean amount to. For example, you might say, “The the intelligence all of the members of the group aggregated to little more than zero.”
I’ll bet the group works for the government.
Aggregate has a few noun meanings. For one, it is an assembly of at least somewhat related things. An example of this would be the aggregate of the numbskulls in the previous example.
The sum total of something is also called its aggregate. For example, I’d like to have the aggregate of a nation’s wealth, even only a mid-sized nation. It’s not going to happen.
In addition, aggregate is rock made up of loosely packed crystals. In the same vein, the result of combining sand, gravel and/or other related materials, which is then mixed with cement to create concrete, is also called aggregate.
The adjective aggregate simply means that whatever the adjective is applied to is something that was formed by the bringing together of its component parts. For example, the above mentioned group’s aggregate IQ is little more than zero.