COMMITMENT - [noun] the act of giving your time and energy to something important to you; a decision to do something; something that you have to do
Examples of use
He's known in the town for his commitment to right-wing politics.
I'm afraid she's got too many commitment this month to help you with your project.
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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