The word "scientia" itself is derived from the Latin verb "scire", which means "to know".
Interestingly, the word "science" didn't come into English directly from Latin. It entered the English language through Old French "science", which was borrowed from Latin "scientia".
So, the journey of the word "science" can be traced back to the Latin root "scire" meaning "to know", leading to "scientia" meaning "knowledge", and finally to the English word "science" with the same basic meaning.