| Basaburúa Mayor | Basaburua |
| basado | based |
| basalto | basalt |
| basamento | base |
| Basamentos piramidales de Mesoamérica | Mesoamerican pyramids |
| basar | set up |
| Basarab I de Valaquia | Basarab I of Wallachia |
| Basarabia | Bessarabia |
| basarse en | rest on |
| base | base |
| Base Amundsen-Scott | Amundsen-Scott South Pole Station |
| Base Artigas | Artigas Department |
| base aérea | air base |
| Base Aérea de Yokota | Yokota Air Base |
| Base aérea Ramstein | Ramstein Air Base |
| Base Belgrano II | General Belgrano II |
| Base Bellingshausen | Bellingshausen Station |
| Base Brown | Almirante Brown Antarctic Base |
| base de datis relacional | relational database |
| base de datos | data base |
| Base de datos de red | Network model |
| Base de datos de tablas de finales | Endgame tablebase |
| Base de datos jerárquica | Hierarchical model |
| Base de datos multidimensional | Multidimensional database |
| Base de datos orientada a objetos | Object database |
| base de datos relacional | relational database |
| Base de datos temporal | Temporal database |
| Base de entornos | Neighbourhood system |
| Base de la Fuerza Aérea de Edwards | Edwards Air Force Base |
| Base de la Fuerza Aérea de Nellis | Nellis Air Force Base |
| Base de Lewis | Lewis base |
| Base Esperanza | Esperanza Base |
| base giratoria para tartas | turntable |
| base jurídica | legal basis |
| Base nitrogenada | Nitrogen-containing base |
| Base Novolazarevskaya | Novolazarevskaya Station |
| Base Orcadas | Orcadas Base |
| Base Palmer | Palmer Station |
| Base Presidente Eduardo Frei Montalva | Eduardo Frei Montalva Station |
| Base Rothera | Rothera Research Station |
| Base Scott | Scott Base |
| Base Soberana | Sovereign Base Areas |
| Base Vostok | Vostok Station |
| BASEketball | BASEketball |
