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Aggregation problem: An aggregate in economics is a summary measure describing a market or economy. The aggregation problem is the difficult problem of finding a valid way to treat an empirical or theoretical aggregate as if it reacted like a less-aggregated measure, say, about behavior of an individual agent as described in general microeconomic theory.
Aggregation (linguistics): Aggregation is a subtask of natural language generation, which involves merging syntactic constituents together. Sometimes aggregation can be done at a conceptual level.
Aggregation (ethology): In ethology, an aggregation is any form of gathering of organisms and the process of coming together. In some forms groups of unrelated species might form, in which interaction between members of the aggregation might be minimal; for example herds of grazing zebra and antelopes might combine, both the better to observe the approach of predators, and to improve the odds of escape in the event of attack by predators.