Rational language means using words and talking in a way that makes sense and is logical. It's like building with blocks - you put the blocks together in a way that makes sense and makes a strong structure.
For example, if you wanted to talk about a toy you have, you might say, "I have a red car that goes vroom." This is rational language because it's clear and makes sense.
On the other hand, if you said, "I have a blue hat that sings songs in the rain," that wouldn't make sense. It's not rational language because it's not logical or accurate.
So when we use rational language, we aim to communicate in a way that is clear and makes sense to others. It helps us to be better understood and communicate more effectively!