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a behavioral convention or pattern characteristic of all members of a particular culture or of all human beings; "some form of religion seems to be a human universal"
(logic) a proposition that asserts something of all members of a class
(linguistics) a grammatical rule (or other linguistic feature) that is found in all languages
coupling that connects two rotating shafts allowing freedom of movement in all directions; "in motor vehicles a universal joint allows the driveshaft to move up and down as the vehicle passes over bumps"