形容词

1. (研究、解释)理论的，理论性的
A theoretical study or explanation is based on or uses the ideas and abstract principles that relate to a particular subject, rather than the practical aspects or uses of it.

2. 理论上的;推想的
If you describe a situation as a theoretical one, you mean that although it is supposed to be true or to exist in the way stated, it may not in fact be true or exist in that way.

1. concerned primarily with theories or hypotheses rather than practical considerations

e.g. theoretical science

Synonym: theoretic

2. concerned with theories rather than their practical applications

e.g. theoretical physics