Englishfor English speakers
mandatory
Adjective
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If something is mandatory, rules or laws say it must be done.
It is mandatory for children to go to school.
minimum
Noun
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The minimum is the lowest number, size, amount, etc. that exists, that is allowed, or that is possible.
Try to keep drinking to a minimum at school.
A minimum of three workers is needed to do the job.
penalty
Noun
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A penalty is a legal punishment for committing a crime.
The penalty for his crime was to pay a fine.
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A penalty is a punishment for breaking the rules.
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A penalty is a payment forfeited if you make an early withdrawal from an account or an investment.
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A penalty is a punishment for breaking the rules of the game; usually, being removed from play for a while.
A penalty was called when he tripped up his opponent.