Englishfor English speakers
authority
Noun
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To have authority means to have the power to make a decision.
This judge has the authority to throw you in jail.
—
If you are an authority on something, many people think you know very, very much about it.
The Pope is the highest authority in the Catholic church.
system
Noun
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A group of things that work together; a way of doing something.
This coloured paper is part of my system for keeping lists of people.