Englishfor English speakers
voluntary
Adjective
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Acting of one's own free will. Something that somebody does is voluntary if the person is doing it because they want to do it, not because someone orders them to do it.
Helping to wash the dishes is voluntary.
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Working without payment.
I have a voluntary position helping children learn to read.
organisation
Noun
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An organisation is a group of people with a particular purpose (e.g., teams, clubs, churches, etc.)
The daycare is operated by a voluntary organisation of parents and teachers.
It is often difficult for women to join these organisations that have always been for men.
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Organisation is the way that something is put together.
The organisation of the book is very difficult to understand.
The organisation of the event took three months.