theoretical subject
The Spanish term 'asignatura teórica' translates to 'theoretical subject' in English. This is often used in academic and educational contexts, and can refer to a subject or field of study that is conceptual rather than practical, that is to say, it requires more brainwork and thinking, rather than hands-on work. It's often used to describe subjects such as philosophy, mathematics, and some aspects of social sciences. While practical subjects might involve performing tasks or making things, theoretical subjects primarily involve thinking, discussing, and reasoning.
This semester I am taking a theoretical subject on philosophy.
This phrase indicates that the speaker is enrolled in a theoretical course focused on the subject of philosophy during the current semester.
The teacher explained that the theoretical subject requires a lot of reading.
This sentence highlights that the theoretical course mentioned by the professor involves a significant amount of reading material.
The theoretical subject of biology is very interesting and complex.
In this example, the speaker expresses their opinion about the theoretical biology course, emphasizing its intriguing and complicated nature.