To make invalid or affect with disease.
To exempt from (often military) duty because of injury or ill health.
Not valid; not true, correct, acceptable or appropriate.
Suffering from disability or illness.
Intended for use by an invalid.
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.
Acceptable, proper or correct; in accordance with the rules.