1) Equivalent 
having equal power or force
• (a.) Having equal power or force; equivalent. • (a.) Having equivalent signification and reach; expressing the same thing, but differently.
E`qui·pol'lent adjective [ Latin aequipollens ; aequus equal + pollens , - entis , present participle of pollere to be strong, able: confer French équipollent .] 1. Having equal power or force; equivalent. Bacon. 2. (Logic) ...
equal in power, effect, etc.; equivalent. · (of propositions, propositional forms, etc.) logically equivalent in any of various specified ways.