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Wiktionary
horizontal integration

n. (context economics English) The integrating of identical stages in the production or marketing process under the ownership or control of a single management organization.

WordNet
horizontal integration

n. absorption into a single firm of several firms involved in the same level of production and sharing resources at that level [syn: horizontal combination]

Wikipedia
Horizontal integration

Horizontal integration is the process of a company increasing production of goods or services at the same part of the supply chain. A company may do this via internal expansion, acquisition or merger.

The process can lead to monopoly if a company captures the vast majority of the market for that good or service.

Horizontal integration is orthogonal to vertical integration, where companies integrate multiple stages of production of a small number of production units.