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The term aggregation may refer to:
- In statistics and social science aggregation means combining statistics from different entities to higher entities.
- Aggregate demand, in economics, combining entities into a single entity which represent them.
- Schooling, in biology, a collection of animals of the same size and body orientation, often cruising in the same direction; applied to fish.
- In cardiovascular physiology, refers to the accumulation of platelets to the site of a wound to form a platelet plug or a thrombus.
- Aggregation, in object-oriented programming.
- Route aggregation, in computer networking
- Aggregation (internet), the process of combining multiple web feeds.
- In business and economics, aggregation is the concentration of a good, service, business functions, or market power in the hands of a small concentrated group of companies, typically by purchasing assets or by mergers and acquisitions.
- In television broadcasting, the merging of several license areas into a single area, allowing competition between broadcasters. For its application in Australia, see List of Australian television channels.
- In content publishing, the ability to combine content from any number of licensed or unlicensed sources into a common venue or distribution channel.
- Agrégation, in French-speaking countries, higher-level competitive examinations for teachers and professors.
- Particle aggregation, in materials science, a physical phenomenon.
- In civil engineering and the earth sciences, aggregation produces soil structure through flocculation and weak cementation.
- Link aggregation, in computer networking, utilizing multiple physical NICs as a single logical interface; "trunking".
- Aggregate analysis, in computer science, especially in analysis of algorithms, refers to a technique used in Amortized Analysis.
- Aggregation, in veterinary epidemiology, is an important factor in the population dynamics of host-macroparasite, is relevant in stabilizing the dynamics toward an equilibrium coexistence.