Learner's definition of COLLECTION
1 : the act or process of getting things from different places and bringing them together
2 [count] : a group of interesting or beautiful objects brought together in order to show or study them or as a hobby — often + of
— sometimes used figuratively
He has a huge collection of CDs.
She has an impressive collection of modern art.
He has quite a collection of exercise equipment.
3 [count] : a request for money in order to help people or to pay for something important also : the money collected in this way — often used before another noun 4 [count] : a group of clothes that a fashion designer has created 5 [count] : a group of different writings that are brought together in one book — often + of