CUSTOM - [noun] an activity or a ceremony that is a part of living or a culture of some particular group of people
Examples of use
There are many customs on St Andrew's Day, but they vary a lot from country to country.
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English speaking practise
Remember that if you don't use that word in English conversations or writing you'll forget it in a short time. So the best thing you can do to learn this word is just trying to use it in speaking or writing. Remember also that practise is the key to fluent english speaking.
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