Of, relating to, extending to, or affecting the entire world or all within the world; worldwide: "This discovery of literature has as yet only partially penetrated the universal consciousness\u201d ( Ellen Key). Including, relating to, or affecting all members of the class or group under consideration: the universal skepticism of philosophers. See Synonyms at general. Applicable or common to all purposes, conditions, or situations: a universal remedy. Of or relating to the universe or cosmos; cosmic. Knowledgeable about or constituting all or many subjects; comprehensively broad. Adapted or adjustable to many sizes or mechanical uses. Logic Encompassing all of the members of a class or group. Used of a proposition. Logic A universal proposition. Logic A general or abstract concept or term considered absolute or axiomatic. A general or widely held principle, concept, or notion. A trait or pattern of behavior characteristic of all the members of a particular culture or of all humans.