aggregate


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aggregate

1. (of fruits and flowers) composed of a dense cluster of carpels or florets
2. Geology a rock, such as granite, consisting of a mixture of minerals
3. a group of closely related biotypes produced by apomixis, such as brambles, which are the Rubus fruticosus aggregate

Aggregate

Any of a variety of materials, such as sand and gravel, added to a cement mixture to make concrete.

aggregate

any collection of units or parts, however temporary or fortuitous; thus the contrast may sometimes be drawn between mere aggregates, with no internal structure or basis for persistence, and GROUPS, COMMUNITIES, etc, which will usually possess clear internal structure, coherence, cohesion and relative persistence.

Aggregate

 

in mineralogy and petrography, an accumulation and accretion of fragments of one or several minerals of varying shapes and structures. Aggregates are classified as cemented, friable, earthy, porous, or dense. According to the shape of the grain, they are called grainy, crystalline, needle-shaped, cubic, fibrous, tangled fibrous, radial, uniform crystalline, shell-shaped, accumulative, and so on; and according to composition, simple—consisting of a single mineral (for example, quartzite, which consists of quartz, and marble, which consists of calcite)—and complex, consisting of several minerals (for example, granite is an aggregate of quartz, feldspar, and mica).

V. P. PETROV

aggregate

[′ag·rə·gət]
(botany)
Referring to fruit formed in a cluster, from a single flower, such as raspberry, or from several flowers, such as pineapple.
(chemistry)
A group of atoms or molecules that are held together in any way, for example, a micelle.
(geology)
A collection of soil grains or particles gathered into a mass.
(materials)
The natural sands, gravels, and crushed stone used for mixing with cementing material in making mortars and concretes.

aggregate

1. An inert granular material such as natural sand, manufactured sand, gravel, crushed gravel, crushed stone, vermiculite, perlite, and air-cooled blast-furnace slag, which when bound together into a conglomerate mass by a matrix forms concrete or mortar.
2. An inert granular material that may be added to gypsum plaster.

aggregate

General term for the mineral fragments or particles which, through the agency of a suitable binder, can be combined in a solid mass, e.g., to form a pavement (ICAO).

aggregate

To gather, collect or assemble. For example, "to aggregate data" means to gather separate sets of data. As a noun, "aggregate data" is data that has been collected from two or more sources. See content aggregator.
References in periodicals archive ?
Let the home and foreign economies be described by the following pairs of reduced form aggregate demand and aggregate supply equations:
When short-run aggregate supply is positively sloped, an increase of aggregate demand increases the price level and real gross domestic product, both of which cause the balance of trade to move into deficit.
Compressive strength values (average of three specimens) of concrete made using three aggregate samples available in Azad Kashmir (Hajira, Kamser and Arja aggregates) and two commonly used aggregates in Pakistan are graphically presented in Fig.
Since implementing the aggregate sand technology, the firm has used an 85:15 used:new sand ratio, reducing its net aggregate sand consumption by 80%.
A porous asphalt aggregate grading consists predominantly of coarse aggregate.
One positive step toward furthering the use of recycled aggregates in highways may be a switch to performance-based and performance-related specifications for materials.
This method involved immersion of a 5-mm-diameter aggregate of soil into a conical flask containing 30 mL of deionised water.
In most audits the auditors treat the aggregate discretely presented component units and the aggregate remaining fund information as separate opinion units.
3121(q) precludes the use of an aggregate estimate, specifying that "wages" include tips, but only those received by an employee in the course of his or her employment, with emphasis on the employer's liability for each individual employee's tips, not on total employee tips.
The team combined the measured chlorpyrifos concentrations in each medium with self-reported time spent indoors at home, time and frequency in contact with carpet, frequency of contact with soil, and amounts of pesticide in the diet samples to derive the exposure to chlorpyrifos for each medium as well as the average daily aggregate exposure.
One consequence of root expansion after penetration of a macropore and subsequent expansion is the enlargement of the pore or fracturing of the aggregate, resulting in an increase in macropore space (Passioura, 1991).
Spending on services remained on a solid uptrend in May, while aggregate purchases of goods turned up after three months of lackluster spending on nondurable goods and motor vehicles.