定做 (dìngzuò) means 'to have something custom-made' — you give instructions to a craftsman or shop to make an item to your specifications, like a suit or furniture. 定制 (dìngzhì) is its close synonym but more often used for modern customization (software, products), while 特制 (tèzhì) means 'specially produced', often implying a special recipe or limited edition.