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| Subject | English | Spanish |
| commun., IT | main beam direct entry interference | interferencia directa del haz principal |
| gen. | main entry | asiento principal (The complete catalogue record of an item, by which it can be uniquely identified and cited) |
| IT, dat.proc. | main entry of a table of contents | entrada principal de un índice de materias |
| IT, dat.proc. | main index entry | entrada principal de índice |