Etymology
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customize (v.)

"to make (something) to a customer's specifications," 1934, American English, from custom (adj.) + -ize. Related: Customizable; customized; customizing.

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customization (n.)

"action of making (something) to a customer's specifications," 1975, noun of action from customize (v.).

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customise (v.)

chiefly British English spelling of customize (q.v.); for spelling, see -ize. Related: Customised; customising; customisation.

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