LAW - [noun] set of rules made by government of a particular country
Examples of use
You can't drink alcohol in the street according to the law.
They imposed a law that forbids smoking in restaurants.
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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.
You can always find a partner, who would also like to improve his/her