Englishfor English speakers
central
Adjective
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A thing is central when it is in the middle.
The house is central to all of the stores.
American
Noun
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A person from the United States of America.
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A person from North America or South America.
American
Adjective
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From the United States.
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From North or South America.
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In a style typical of the United States.
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In a style typical of the Americas (North and South America).
commission
Noun
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A commission is a group of people who work together to research or manage something for a government.
She was recently appointed to head the European commission on climate change.
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A commission is money that a salesperson receives for each sale.
You may have to pay commission to convert the dollars into local currency on your travels.
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The official appointment of an officer in a nation's armed forces.
Brummell resigned his commission when his regiment was posted to Manchester.
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A commission is a task to be undertaken.
My commission was only to deliver this message.
commission
Verb
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If you commission someone to do or create something, you formally ask them to do it.
The report commissioned by the Department of Health in 1989, contains guidelines on how best to manage and organise waiting lists.
on
Preposition
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positioned at the upper surface of, touching from above
The apple is on the table.
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at the date of
Tim was born on the 4th of July.
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along, forwards (continuing an action)
drive on, rock on
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about, dealing with the subject of
I have a book on history.
There was a World Summit on the Information Society a few weeks ago.
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touching; hanging from
I have no money on me at the moment.
I would like to eat the fruit on the trees.
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because of, due to
He was arrested on suspicion of bribery.
I contacted Joanne on a hunch that she would know about it.
The stock price increased on news of a new product.
on
Adjective
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If something is on, it is active, functioning or operating.
The television is on.
The lights are on, so it is very bright.
environment
Noun
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The environment is the natural world: forests, rivers, grasslands, oceans, etc.
We have to do more to protect the environment from pollution.
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Your environment is the situation or area that you live, work, or spend time in, including the people, buildings, vehicles, etc.
When we moved to the city, we found ourselves in a comepletely new social environment.
This course will prepare students for a career in a software engineering environment in industry or research.
The learning environment can have a large effect on your grades.
and
Conjunction
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You use and to talk about two things at once.
I like singing and reading.
Mary and Jane went on a holiday together.
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You use and when you are listing a few things and you are now on your last item of the list.
I like singing, reading, cycling and playing soccer.
I used to like this girl from my class as she is pretty, gentle and caring.
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And is used when you are putting two sentences together.
She came into the store, shouted at the cashier, and left.
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Used to show what happened after something else.
The alarm went off and I woke up.
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And is used to join certain numbers together.
Two hundred and thirty-five people went missing after the earthquake.
development
Noun
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growth
The development of this story has been slow.
The organism has reached an important part in its development.
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Something which has developed
Our news team brings you the latest developments.
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A real estate development.
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Using new ideas for practical problems.
Our development department has created three new adhesives this year.
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The active placement of the pieces, or the process of doing it
White's development is good, but black's has been hampered by the pawn on e5.