Mid 19th century. From post-classical Latin synergia cooperation from ancient Greek συνεργία cooperation from συνεργός working together (from συν- + -εργος: see -ergic) + -ία.
Definition of synergia in US English:
synergia
nounsɪˈnəːdʒ(ɪ)ə
Chiefly Physiology and Pharmacology= "synergy".
Origin
Mid 19th century. From post-classical Latin synergia cooperation from ancient Greek συνεργία cooperation from συνεργός working together (from συν- + -εργος: see -ergic) + -ία.