Cogent means:
* Forceful and clear; convincing.
* Having a strong and logical appeal that is likely to persuade.
Here are some examples of how "cogent" is used:
* "She presented a cogent argument for the new policy."
* "The evidence presented was not cogent enough to secure a conviction."
If you meant to use "congent" in a different context, please provide more information, and I will be happy to help.