| Subject | English | Catalan |
| math. | Bartlett relation | relació de Bartlett |
| environ. | cause-effect relation The relating of causes to the effects that they produce | relació causa-efecte |
| math. | confluent relation | relació confluent |
| environ. | East-West relations | relacions Est-Oest |
| environ. | foreign economic relations Dealing in economic or monetary matters with foreign countries | relacions econòmiques estrangeres |
| environ. | international environmental relations The political or diplomatic interaction or dealings between independent nations that pertain to ecological concerns | relacions ambientals internacionals |
| environ. | international relations The political or diplomatic interaction or dealings between independent nations | relacions internacionals |
| environ. | labour relations The dynamics or general state of the association between management and non-management employees in an enterprise, industry or nation, with special attention to the maintenance of agreements, collective bargaining and the status of unions | relacions laborals |
| environ. | monetary relations The different modes in which countries, nations, etc., are brought together by financial, currency, or pecuniary interests | relacions monetàries |
| environ. | power-heat relation The ratio of the work done by an engine to the heat supplied | relació força-calor |
| libr. | press relations department | oficina de premsa |
| libr. | press relations department | gabinet de premsa |
| libr. | press relations department | departament de premsa |
| environ. | public relations The methods and activities employed by an individual, organization, corporation, or government to promote a favourable relationship with the public | relació pública |
| environ. | race relations The associations, tensions or harmony between two or more groups of people distinguished by history, culture, religion or physique: distinctions erroneously construed as being based on consistent biological differences and as representing, in effect, species of a human genus | minories i relacions racials |
| math. | reversible relation | relació reversible |
| environ. | trade relations | relacions comercials |