COMPETITIVE - [adjective] involving desire to be more successful than the others
Examples of use
Football is one of the most competitive sports in the world.
The market of electronic devices is very competitive because of high innovation.
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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