It comes from the Latin verb *suādēre*, which means "to sweeten," "to make pleasant," or "to make agreeable." The idea is that persuasion often involves making something more appealing or attractive to someone.
Here are some examples of words that use the root *suade*:
* Persuade: To convince someone to do something.
* Dissuade: To discourage someone from doing something.
* Assuasive: Having the power to soothe or calm.
* Suasion: The act of persuading.
* Suadable: Easily persuaded.