DESTINY - [noun] something that is certain to happen
Examples of use
I'm sure he will win the elections. It's his destiny to lead his country.
They believe it was their destiny to meet each other and be together for the rest of their lives.
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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