the basic, underlying framework or features of a system or organization.
the fundamental facilities and systems serving a country, city, or area, as transportation and communication systems, power plants, and schools.
the military installations of a country.

1925–30; infra + structure

infrastructural, adjective

1. basis, foundation, support. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
infrastructure (ˈɪnfrəˌstrʌktʃə)
1.  the basic structure of an organization, system, etc
2.  the stock of fixed capital equipment in a country, including factories, roads, schools, etc, considered as a determinant of economic growth

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1927, from Fr. (1875), from infra- (q.v.) + structure. The installations that form the basis for any operation or system. Originally in a military sense.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Ensures needed building and infra structure repairs are brought to the attention of the immediate supervisor.
The plant produces various sizes of rebar products for the infra structure sector.
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