valid

обосно́ванный

Well-grounded or justifiable, pertinent

• The ticket is valid until 29 April.

  Билет действителен до 29 апреля.

  Tatoeba · sundown · CC BY 2.0 FR

• This ticket is valid for a month.

  Этот билет действует месяц.

  Tatoeba · araneo · CC BY 2.0 FR

обосно́ванный

Acceptable, proper or correct; in accordance with the rules

обосно́ванный

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

обосно́ванный

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

обосно́ванный

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

обосно́ванный

Genuine - as distinguished from efficient or regular - sacramentредкое