Luck means someone’s good fortune.(noun)
An example of luck is winning easily when gambling.
Luck is defined as the good or bad things that happen by chance.(noun)
An example of luck is what happens when good things start happening to someone.
See luck in Webster's New World College Dictionary
Origin: ME lucke, prob. < MDu luk, contr. < gelucke < ODu *gilukki (> Ger glück, fortune, good luck) < ? IE base *leug-, to bend (> leek, lock): basic sense “what bends together,” hence, “what occurs, what is fitting, lucky occurrence”
See luck in American Heritage Dictionary 4
Origin: Middle English lucke
Origin: , from Middle Dutch luc
Origin: , short for gheluc.
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