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Multiple Meanings
function — as in:  Its main function is to...

The function of the lens of the eye is to focus light on the retina.
purpose, job, or natural activity
function — as in:  can’t function well without sleep

I don’t function well on less than six hours of sleep a night; and I do best on nine.
work or operate — sometimes to work or operate normally or in a particular way
function — as in:  I’m attending a function tonight

I promised to attend their function tonight. I think it’s important that we show our support.
a social event or ceremony — especially one attended for work or out of a sense of duty
function — as in:  oxygen is a function of altitude

Their success is a function of their teamwork and practice.
saying one results from another; or saying that the amount of one thing is dependent upon the value of another.
function — as in:  Amazon’s new search function

I like Amazon’s new search function.
computer code that performs a specific task
function — as in:  a mathematical function

What is the function to calculate how much carpet is required to cover a rectangular room of a given length and width?
a formula or mathematical expression that describes a relationship between variables

For more specialized meanings in math and chemistry, see a comprehensive dictionary.
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