| Subject | English | Catalan |
| environ. | primary education The first five or six years of instruction in elementary schools | ensenyament primari |
| comp., MS | primary e-mail address | adreça electrònica principal (The e-mail address that appears in the E-Mail Options section of the user's mailbox in the Web management interface for Outlook Live) |
| environ. | primary energy consumption Consumption of energy used in the same form as in its naturally occurring state, for example crude oil, coal, natural gas, e.g. before it is converted into electricity | consum d'energia primària |
| environ. | primary forest Forest which originally covered a region before changes in the environment brought about by people | selva verge |
| environ. | primary sector That part of a country's or region's economy that makes direct use of natural resources, including agriculture, forestry, fishing and the fuel, metal and mining industries | sector primari |
| environ. | primary treatment Removal of floating solids and suspended solids, both fine and coarse, from raw sewage | tractament primari |
| math. | primary unit | unitat primària |
