Englishfor English speakers
measure
Verb
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If you measure something, you calculate its size, mass, temperature, etc. using units like centimetres, kilograms, degrees, etc.
Before clocks, time was measured by the movement of the moon and the sun.
Ireland's smallest church measures 3.6 cm by 1.8 m.
measure
Noun
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A measure is something that you do, usually to solve a problem.
The police are taking all necessary measures to guarantee the safety of people.
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A measure of something is a way to judge or assess it.
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A measure of something is an amount of it.
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.