01 a. Strong; powerful; efficient.
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1.
Strong; powerful; efficient.[Obs.]
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2.
Having sufficient strength or force; founded in truth; capable of being justified, defended, or supported; not weak or defective; sound; good; efficacious; as, a valid argument; a valid objection.“An answer that is open to no valid exception.” — I. Taylor.
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3.
Having legal strength or force; executed with the proper formalities; incapable of being rightfully overthrown or set aside; as, a valid deed; a valid covenant; a valid instrument of any kind; a valid claim or title; a valid marriage.(Law)
Syn.
Prevalent; available; efficacious; just; good; weighty; sufficient; sound; well-grounded.