1. universal, linguistic universal, rule, linguistic rule
usage: (linguistics) a grammatical rule (or other linguistic feature) that is found in all languages
2. universal, universal proposition, proposition
usage: (logic) a proposition that asserts something of all members of a class
3. universal, convention, normal, pattern, rule, formula
usage: 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"
4. universal joint, universal, coupling, coupler
usage: 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"