Englishfor English speakers
association
Noun
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An association is a way that two things are similar, belong together, or are connected or related.
I don't see any association between what happened to you and what happened to me.
I suspect there is an association between the weather and the number who are sick.
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An association is a group of people who have a common goal or interest.
The NBA stands for the "National Basketball Association."
I have been a member of the American Psychological Association and the American Speech-Language-Hearing Association.
All the teachers were at an association meeting.
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Association is the when you associate (spend time with certain people).
I'm afraid your association with those wild people will get you in trouble.
for
Preposition
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shows that something belongs to something else, or has a specific function
This cake is for you.
This is a net for catching fish.
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For is used to show the reason for something
He was angry, for he had never been called such terrible names before.
for
Subordinator
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For introduces a clause with a subject and a to-infinitive
It's not good for you to be too relaxed.
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.
surgical
Adjective
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If something is surgical, it is related to or used in a surgery.
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If something is surgical, it is done with precision or high accuracy.
The building was destroyed with a surgical air-strike.
contraception
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noun
birth control by the use of devices (diaphragm or intrauterine device or condom) or drugs or surgery