Tenent was the common spelling in the 1600s for tenet, which was defined as a belief or principle. Today it is a common misspelling for either tenet or tenant, which are defined as someone who rents a space.
(noun)An example of tenent was the 1644 book The Bloudy Tenent of Persecution, for Cause of Conscience, which was written by Roger Williams the founder of the colony in Rhode Island and the co-founder of the First Baptist Church in America.