Noun
(architecture) The lowest projecting part of a baseboard, a pedestal or a similar construct.
(mathematics) A certain subcollection of a topological space
Source: en.wiktionary.org24: quadrovigesimal The Sko languages have a base-24 system with a subbase of 6. 32: duotrigesimal main Ngiti has base 32. 60: sexagesimal main Ekari has a base-60 system. Source: Internet
Concrete is a rigid pavement, which can take heavier loads but is more expensive and requires more carefully prepared subbase. Source: Internet
Modern pavements are designed for heavier vehicle loads and faster speeds, requiring thicker slabs and deeper subbase. Source: Internet