Your internet skills are weak :p
http://dictionary.reference.com/browse/infrastructure


–noun
1. the basic, underlying framework or features of a system or organization.
2. the fundamental facilities and systems serving a country, city, or area, as transportation and communication systems, power plants, and schools.
3. the military installations of a country.
Origin:
1925–30; infra + structure

Related forms:
in⋅fra⋅struc⋅tur⋅al, adjective

Synonyms:
1. basis, foundation, support.