Trefnoldeb, n. orderliness
Trefnol, a. orderly, systematic
Trefnu, v. to order, to dispose
Trefnus, a. orderly, decent, tidy methodical
Trefnusder, n. orderliness
Trefnydd, n. one who orders, a manager; an economist; a Methodist
Trefnyddiaeth, n. economy; Methodism
Trefnyddio, v. to methodise
Trefol, a. relating to home
Treftad, n. patrimony