rationalist

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I speak as one who was intended by my father to be brought up as a Rationalist.
我的父亲曾有意把我培养成一个理性主义者，我即以此身份发言。
If reason should lead you to orthodox conclusions, well and good; you are still a Rationalist.
如果理性可以引领你到达传统的结论，那很好，你仍然是一个理性主义者。
It would be perfectly possible to be a complete and absolute Rationalist in the true sense of the term and yet accept this or that dogma.
在这一概念的真正意义上做一个完全的、绝对的理性主义者，而又同时接受这个或那个教条，这完全是可能的。

This side might be termed the rationalist school of Christmas, the Hayek side, the conservative side, the realist side, even the masculine side.
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At the core of the predominant current Western assessment lies the assumption that Gorbachev is, at a fundamental level, a Western rationalist in a modern mold.
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Philosophers, to prevent their works (or themselves) being burnt, were obliged to dedicate them to the proper authorities, even if the rationalist content was actually subversive.
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someone whose actions and decisions are based on reason rather than emotions or beliefs

If you describe someone as rationalist, you mean that their beliefs are based on reason and logic rather than emotion or religion.
If you describe someone as a rationalist, you mean that they base their life on rationalist beliefs.