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| Subject | English | Catalan |
| environ. | common agreement A system of law established by following earlier judicial decisions and customs, rather than statutory or legislatively enacted law | acord comú |
| environ. | common agricultural policy The set of regulations and practices adopted by member countries of the European Community that consolidates efforts in promoting or ensuring reasonable pricing, fair standards of living, stable markets, increased farm productivity and methods for dealing with food supply or surplus | política agrícola comuna |
| environ. | common commercial policy The set of uniform trade principles or practices established by an European Community customs union, which implements common tariff rates, tariff and trade agreements with non-member countries, import and export policies, and export promotion | política comercial comuna |
| math. | common factor | factor comú |
| math. | common factor space | espai dels factors comuns |
| math. | common factor space | espai factor comú |
| math. | common factor variance | comunalitat |
| math. | common factor variance | variància dels factors comuns |
| math. | common factor variance | variància factorial comuna |
| environ. | common tariff policy A course of action adopted and pursued by member countries, in which it is agreed to impose a system of duties or tax charges on imports from non-member countries | política aranzelària comuna |