Englishfor English speakers
function
Noun
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Something or someone's function is its purpose or its job.
The army sometimes performs a policing function.
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A function is an organised event.
I met Sylvia at a church function last week.
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If mathX/math is a function of mathY/math, then mathX/math exists because of or is affected by mathY/math
The speed of the computer is a function of its main processor.
When you see, mathY=f(X)/math, you read it, "mathY/math is a function of mathX/math". Here the value of mathY/math depends on the value assigned to the variable mathX/math.
function
Verb
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If something is functioning, it is working and is not completely broken.
Her heart stopped, but her brain continued to function.
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If something functions as mathX/math, it does the job of mathX/math.
In this sentence, "sentence" functions as the subject.
of
Preposition
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Made using.
It is a house of cards.
rapid
Adjective
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If an action or idea is rapid, it happens quickly.
rapid
Noun
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A fast part of a river or stream.
growth
Noun
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The act of growing (getting bigger); an increase in size, number, value, or strength.
I'm pleased with the growth in value of our house in the years after we bought it.
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Something that grows or has grown; a mass that is not normal, such as a tumor.
There was a healthy growth of bushes near the house.
He died of a growth in his brain.