1. The basic structure or features of a system or organization
   - infrastructure 
2. Lowest support of a structure
   - foundation, base, fundament, foot, groundwork, understructure

Derived forms: substructures

Type of: structure, support

Part of: construction, structure, system

Encyclopedia: Substructure

• Allen screw
• Allen Stewart Konigsberg
• Allen Tate
• Allen wrench
• Allentown
• allergen
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• alleyway