He gratified himself by buying the gaming console he had always wanted.

gratified 是动词 gratify 的过去式，gratify 由词根 grat-（表示"高兴、感激"，来自拉丁语 gratus）和后缀 -ify（表示"使...化"）组成，意思是"使满足、使高兴"。在这里指"满足自己的愿望"。