of, relating to, or located on the right
in the direction or orientation to the right-hand rule (a right-hand thread)
designed for use by the right hand
Acceptable, proper or correct; in accordance with the rules.
Well grounded or justifiable, pertinent.
Of an argument: whose conclusion is always true whenever its premises are true.
Genuine - as distinguished from efficient or regular - sacrament.
Related to the current topic, or presented within context, relevant.
Of a formula or system: such that it evaluates to true regardless of the input values.