1 Art a style or movement in which assorted mechanical objects are combined into abstract mobile structural forms. The movement originated in Russia in the 1920s and has influenced many aspects of modern architecture and design.
[transliterating Russian konstruktivizm]
2 Mathematics a view which admits as valid only constructive proofs and entities demonstrable by them, implying that the latter have no independent existence.
noun & adjective
constructivism in other Oxford dictionaries
Definition of constructivism in the US English dictionary