Englishfor English speakers
contributor
Noun
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A contributor is a person who donates money to a charity or a cause.
I am a contributor to Red Cross.
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A contributor is a person who supports or participates in a cause, activity or institution.
He was a regular contributor to anti-war protests.
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A contributor is a person who is important to the creation or growth of something.
With her strength and intelligence, she is an important contributor to the local gene pool.
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A contributor is a person who produces articles published in a newspaper, magazine, online publication, etc.
William Safire has been a notable contributor to the opinion page of the New York Times for many years.
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A contributor to something is a partial cause of that thing.
One contributor to the problem is the rapid change in the workforce.
role
Noun
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The role of a person or thing is the job that they do in a certain situation.
In the past twenty-five years the role of women on farms had changed dramatically.
Music plays an important role in the movie.
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role is another word for a part in a theatrical work such as a play or a ballet
Tamara Karsavina was the first to dance the role of the Firebird.
I was cast in the role of the crazy old witch in the school play.