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infrastructure

IN-fruh-struk-chur /ˈɪnfrəstrʌktʃər/

nounB2GREIELTSTOEFLCATUPSC

formaleconomiccivic

The basic physical and organizational structures and facilities (e.g., roads, power grids, schools) needed for the operation of a society or enterprise.

Refers to foundational networks enabling economic and social productivity, including both physical structures and modern digital assets.

The story behind the word. Formed in late 19th-century French ('infrastructure') from Latin 'infra' (below) and 'struere' (to build). Originally a military and railway term designating the permanent earthworks and tracks beneath rolling stock, it entered general English during World War II and NATO planning to describe physical defense facilities.

Word relationships

framework: Framework is an abstract supporting structure, while infrastructure usually denotes physical networks like roads and grids.
substructure: Substructure strictly refers to underlying structural bases (like foundations under buildings).

superstructure: Superstructure refers to things built on top of a foundational base.

Commonly confused with

superstructure: Infrastructure is the foundational grid beneath; superstructure is what rests on top.

Word family

infrastructural (adjective): Relating to basic structural foundations.

Collocations

critical infrastructure
aging infrastructure
transport infrastructure
digital infrastructure

Example sentences

"Substantial investments in transport infrastructure are necessary to support the expanding population of the capital city." Urban planning debate
"Modern economic growth relies heavily on digital infrastructure such as high-speed broadband and cloud data centers." Digital economy reform

Memory hook

INFRA (below) + STRUCTURE = The structure built below that supports everything above. Infrastructure = Underlying foundations.

When not to use

Do not use to describe a single small appliance or temporary mobile piece of equipment.

Fun facts

The word infrastructure wasn't widely used in American English until the 1980s, when political debates over crumbling roads made it popular.