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English word valid comes from Latin valete (Goodbye, farewell.), Latin -idus ((suffix forming verbs) tending to.)
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valete (Latin)
Goodbye, farewell.
-idus (Latin)
(suffix forming verbs) tending to.
validus (Latin)
Healthy, well. Strong. Valid. Worthy.
valide (Middle French)
valid (English)
(logic) Of a formula or system: such that it evaluates to true regardless of the input values.. (logic) Of an argument: whose conclusion is always true whenever its premises are true.. Acceptable, proper or correct.. Related to the current topic, or presented within context, relevant.. Well grounded or justifiable, pertinent.