compulsory

1. Required; obligatory; mandatory.

   The ten-dollar fee was compulsory.

   obligatorisch, pflichtmäßig, gesetzlich

   обяза́тельныйobjazátelʹnyj

   обов'язко́вийobovʺjazkóvyj

   required by rule

2. Having the power of compulsion; constraining.

   Such compulsory measures are limited.

   zwangsweise, verpflichtend

   принуди́тельныйprinudítelʹnyj

1. It's not compulsory.

   ruЭто необязательно. — marafon

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2. Participation isn't compulsory.

   ruУчастие необязательно. — odexed

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3. It isn't compulsory.

   ruЭто необязательно. — marafon

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4. Attendance is compulsory for all members.

   Присутність усіх членів обов'язкова. — aandrusiak

   ruПрисутствие всех членов обязательно. — redscorp

   deEs besteht Anwesenheitspflicht für alle Mitglieder. — raggione

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5. He regards so-called compulsory education as useless.

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regular