1. plural of subbase: foundation layers beneath a main base, especially in construction or engineering
Usage: technical; construction
2. plural of subbase: subsidiary military installations or facilities supporting a main base
Usage: military

Examples

• The engineers inspected the concrete subbases before pouring the main foundation.
• Multiple subbases were constructed to support the highway project.
• The military established several subbases around the main installation.
• Road construction requires properly compacted subbases for stability.
• The contractor laid gravel subbases beneath the parking lot surface.
• Strategic subbases provided logistical support during the operation.