Mid 19th century; earliest use found in John Cairns (1818–1892), minister of the United Presbyterian church and theologian. From reconstructive + -ness.
Definition of reconstructiveness in US English:
reconstructiveness
nounˌriːkənˈstrʌktɪvnɪs
The fact or quality of being reconstructive.
Origin
Mid 19th century; earliest use found in John Cairns (1818–1892), minister of the United Presbyterian church and theologian. From reconstructive + -ness.