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[suhb-beys] /ˈsʌbˌbeɪs/
Architecture. the lowest part of a base, as of a column, that consists of two or more horizontal members.
Mathematics. a collection of subsets of a topological space having the property that every open set of a given topology can be written as the union of intersections of finite numbers of sets in the collection.
Compare base1 (def 13b).
1820-30; sub- + base1
Related forms
subbasal, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for subbase
  • The purpose of a subbase under a rigid pavement is to provide uniform stable support for the pavement slabs.
  • Any selected course of material placed beneath the base is referred to as a subbase.
  • There shall be no snow, frost, or standing water on the subbase course.
  • The subbase surface shall be contoured to lines and grades indicated on the drawings.
  • The roadbed rises in elevation as each increment or layer of subbase, base, surfacing or pavement is placed.
  • The materials are mixed cold and will be used as a subbase course.
  • Where necessary, material conforming to the subbase specification shall be utilized to perform the adjustment.
  • Fine grade the subbase to achieve maximum uniform support.
  • Where existing scarified surface is low or has excessive cross slope, build up the surface with subbase material, as necessary.
  • The subbase shall be constructed to the thickness shown on the plans.
British Dictionary definitions for subbase


the lowest part of a pedestal, base, or skirting Compare surbase


another name for bourdon
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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