Etymology
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infrastructure (n.)

1887, from French infrastructure (1875); see infra- + structure (n.). The installations that form the basis for any operation or system. Originally in a military sense.

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Definitions of infrastructure

infrastructure (n.)
the basic structure or features of a system or organization;
Synonyms: substructure
infrastructure (n.)
the stock of basic facilities and capital equipment needed for the functioning of a country or area;
Synonyms: base
From wordnet.princeton.edu