Tenet comes from Latin tenet ('he holds'), third-person singular present of tenere ('to hold'), referring to a belief 'held' as true. The historical chain includes Latin tenet and Latin tenere. The quoted older senses, "he holds", "to hold", and "held", supply the semantic anchors for tenet. The formation is best read as borrowed: the word tenet carries its older form-history into a compact English lexical shape. In present English it is used as a noun, "a principle or belief held as part of a doctrine". Related English forms include tenable, tenacious, retain, and tenant. The result is a noun whose etymology preserves both the older form and the later English specialization.