rationalist

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I speak as one who was intended by my father to be brought up as a Rationalist.
我的父親曾有意把我培養成一個理性主義者，我即以此身份發言。
If reason should lead you to orthodox conclusions, well and good; you are still a Rationalist.
如果理性可以引領你到達傳統的結論，那很好，你仍然是一個理性主義者。
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.
在這一概唸的真正意義上做一個完全的、絕對的理性主義者，而又同時接受這個或那個教條，這完全是可能的。

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.