valid

1. Well-grounded or justifiable, pertinent.

   I will believe him as soon as he offers a valid answer.

   well grounded in logic or truth or having legal force

2. Acceptable, proper or correct; in accordance with the rules.

   A valid format for the date is DD/MM/YY.

   Do not drive without a valid license.

   gültig

   действи́тельныйdejstvítelʹnyj, корректныйkorrektnyj, правильныйpravilʹnyj

   ді́йснийdíjsnyj, дійови́йdijovýj

3. Related to the current topic, or presented within context, relevant.

4. Of a formula or system: such that it evaluates to true regardless of the input values.

5. Of an argument: whose conclusion is always true whenever its premises are true.

   An argument is valid if and only if the set consisting of both (1) all of its premises and (2) the contradictory of its conclusion is inconsistent.

6. Genuine - as distinguished from efficient or regular - sacrament.

1. This offer is valid for five days.

   Ця пропозиція дійсна п'ять днів.

   ruЭто предложение действительно в течение пяти дней.

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2. Please enter a valid email address.

   ruВведите действительный адрес электронной почты, пожалуйста.

   deBitte geben Sie eine gültige E-Mail-Adresse ein.

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3. I think my complaint is valid.

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4. I think those are valid concerns.

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5. This ticket is no longer valid.

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regular