OED
A collective term for the subordinate parts of an undertaking; substructure, foundation; spec. the permanent installations forming a basis for military operations, as airfields, naval bases, training establishments, etc.1927 The tunnels, bridges, culverts, and 'infrastructure' work generally of the Ax to Bourg-Madame line have been completed. Chambers's Journal 14 May 374/2
1950 In this Debate we have had the usual jargon about 'the infrastructure of a supra-national authority’' W. S. Churchill in Hansard Commons vol. CDLXXVI. 2145
1951 This new term 'infrastructure'..denotes fixed military facilities such as airfields, base installations and transport systems. European Review October 2/1
1956 What I call the infrastructure is the regularly produced two- or four-beat meter (2/2 or 4/4 measure) that characterizes any jazz performance. D. Noakes, translation of A. Hodeir, Jazz 197
1957 Thirty years ago, the dominant school of thought in the Soviet Union undertook..the task of analysing the infrastructure of society. T. Kilmartin, translation of R. C. F. Aron, Opium of Intellectuals iv. 133
1960 Part of the Nato infrastructure programme. Times 9 December 14/2
1971 A.I.D. assistance will be focused on Vihiga Division and will..upgrade the infrastructure of roads and other social services. Inside Kenya Today March 15/1
1971 A very complex infrastructure of scores of vernacular languages. J. Spencer, English Language in West Africa 31