Brain vs. Explain: The Tale of Two Words

Understanding the Difference Between “Rational” and “Rationale”

History of the Words

The word “rational” comes from Latin “rationalis,” which means “reason.” It has been used in English since the 14th century. “Rationale” also comes from Latin, “rational” in the sense of “reason or explanation.” It has been used in English since the 17th century.

How to Use the Words

“Rational” is an adjective. It describes someone or something that uses reason and logic. If you are rational, you think clearly and make sense.

“Rationale” is a noun. It refers to the reason or explanation for something. When you give a rationale, you provide why something was done.

Trick to Remember the Difference

Remember: “Rational” ends with the letters “-al,” just like “mental.” Both relate to thinking. “Rationale” ends with an “-e,” just like “excuse.” Both explain something.

Examples of “Rational”

• It is rational to wear a coat in the cold.
• She made a rational decision to save money.
• His argument was clear and rational.
• Thinking in a rational way helps solve problems.
• Being rational means controlling your emotions.

Examples of “Rationale”

• The rationale for the rule was student safety.
• He explained the rationale behind his actions.
• We need a clear rationale for the project.
• What is the rationale for this decision?
• Her rationale made sense to everyone.

Summary

Remember, “rational” means thinking clearly with reason and logic. It’s how someone acts or thinks. “Rationale” is the reason or explanation for something. It’s like the why behind actions or decisions. Keep these differences in mind when deciding which word to use!