A relation R is transitive if x R y & y R z => x R z. Equivalence relations, pre-, partial and total orders are all transitive.

In addition suitable contents:
[ = ] [ al ] [ an ] [ ar ] [ at ] [ de ] [ E ] [ er ] [ io ] [ is ] [ it ] [ la ] [ nc ] [ ns ] [ pa ] [ pr ] [ re ] [ relation ] [ si ] [ sit ] [ to ] [ tr ] [ va ] [ ve ]