(countable) the process of becoming different.
The product is undergoing a change in order to improve it.
(uncountable) small denominations of money given in exchange for a larger denomination.
Can I get change for this $100 bill please?
(countable) a replacement, e.g. a change of clothes
(baseball) a change-up pitch
(uncountable) money given back when a customer hands over more than the exact price of an item.
A customer who pays with a 10-pound note for a £9 item receives one pound in change.
(countable) a transfer between vehicles
The train journey from Bristol to Nottingham includes a change at Birmingham