This root appears in many English words, including:
* Cognition: the mental process of knowing
* Recognize: to know again
* Agnostic: a person who believes that the existence of God is unknown or unknowable
* Diagnosis: the identification of a disease
* Prognosis: a forecast of the likely course of a disease or ailment
* Gnosis: esoteric knowledge or wisdom
* Ignorant: lacking knowledge or information
* Incognito: with one's identity concealed