Learner's definition of CURIOSITY
1 [noncount] : the desire to learn or know more about something or someone
Her natural curiosity led her to ask more questions.
The arrival of a construction crew at their house attracted/sparked/aroused the curiosity of their neighbors.
The movie failed to satisfy her curiosity about the assassination.
He went into the store out of curiosity. [=because he was curious to see what was in the store]
◊ The expression curiosity killed the cat is used to warn people that too much curiosity can be dangerous.
2 [count] : something that is interesting because it is unusual