WordReference Random House Unabridged Dictionary of American English © 2026
sub•struc•tion
(sub struk′shən),USA pronunciation n.
sub•struc′tion•al, adj.
- a foundation or substructure.
- Latin substructiōn- (stem of substructiō) foundation, equivalent. to substruct(us), past participle of substruere to lay a foundation (sub- sub- + struc-, variant stem of struere to arrange, put in order + -tus past participle suffix) + -iōn- -ion
- 1615–25