COMMERCIAL - [adjective/noun] related to buying and selling / advertisement on TV or radio
Examples of use
What drives me mad while watching films is a commercial break every 20 minutes.
Commercials are the main source of media income.
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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