It's related to the English word "cognizant," meaning "having knowledge or being aware of something."
Here are some examples of words containing the root "cogn":
* Cognition: The mental process of knowing, including awareness, perception, reasoning, and judgment.
* Recognize: To identify someone or something as known from previous experience.
* Cognizant: Aware of something.
* Incognito: Disguised or concealed, so as not to be recognized.
* Cognate: Related in origin, especially of words in different languages.
So, essentially, the root "cogn" signifies knowledge, understanding, and awareness.