The ancient Greek word γιγνώσκω (gignosko) means I know.   From this word, English derives all kinds of brainy words.  Gnostic, agnostic, prognosis, and diagnosis derive from γιγνώσκω. 

To say, “I know,” the Romans would use the Latin word cognosco.  From cognosco, English derives cognition, connoisseur, recognition, and incognito.

This week, we will increase our knowledge of English by looking at the Greek and Latin words behind “knowing”.