unional /ˈjuːnjənəl/ adjective2 •Pertaining to a union.When man is unional, the spirit conceives and brings forth strength, the soul listens to wisdom and is led into security, the body has issue in stedfastness and peace. — 1843 •(rare) Pertaining to the European Union.The principle of conferral binds the EU with respect to any unional action and can be understood as a presumption in favour of the competences of the Member States. — 2011