In content publishing, the ability to combine content from any number of licensed or unlicensed sources into a common venue or distribution channel.

In cardiovascular physiology, refers to the accumulation of platelets to the site of a wound to form a platelet plug or a thrombus.

Aggregate demand, in economics, combining entities into a single entity which represent them.

Link aggregation, in computer networking, utilizing multiple physical NICs as a single logical interface; "trunking".

Aggregation (internet), the process of combining multiple web feeds.

Agrégation, in French-speaking countries, higher-level competitive examinations for teachers and professors.

Route aggregation, in computer networking

Particle aggregation, in materials science, a physical phenomenon.

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 civil engineering and the earth sciences, aggregation produces soil structure through flocculation and weak cementation.

Aggregate analysis, in computer science, especially in analysis of algorithms, refers to a technique used in Amortized Analysis.