cus ‧ tom ‧ ize BrE AmE ( also customise British English ) /ˈkʌstəmaɪz/ verb [transitive]
[ Word Family: adjective : ↑ customary , ↑ custom , ↑ customizable , ↑ accustomed ; noun : ↑ custom , ↑ customer , customs; verb : ↑ accustom , ↑ customize ; adverb : ↑ customarily ]
to change something to make it more suitable for you, or to make it look special or different from things of a similar type:
a customized car