definition / (defl'nijn; /1eks'm/sn/ n 1 [U] defining; [C] statement that defines: 闡明; 定套; 界說： To give a ~ Qf a word is more difficult than to give an illustration of its uses. 給一個字下定義，較之舉例說明它的用法為難。 2 [U] clearness of outline; makihg or being distinct in outline; power of a lens (in a camera or telescope) to show clear outlines. 輪廓清楚; (使) 輪廓鮮明; (照相機或望遠鏡中) 透鏡之淸晰度。