DEPARTMENT - [noun] a division of an organisation
Examples of use
Sorry, where's the toy department? On the left of the shop, next to the books.
The government promised that the Department of Environmental Protection will take steps to prevent further water pollution.
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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