what is the right word of this definition? To enjoy yourself more than ever before. many thanks in advance

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Well there is an expression you could use: "have the time of your life".
e.g. I had the time of my life at that live concert yesterday.

"have the time of one's life" = means to enjoy oneself more than ever before.

http://idioms.thefreedictionary.com/have+the+time+of+life

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Yes you can use this expression

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you can also say that it was the best day of your life=)