界定，定义：对事物界限的清楚确定

n.白内障的定义,明度

ˏdєfәˋnIʃәn; ˏdefiˊniʃn< def.i.ni.tion >
[次常用字]
<<名词>>
((缩)) def.
1 a. 定义
b. 字义; 释义
2 下定义
3 a. 确定
a definition of one's intentions 一个人意向的确定
b. 清晰; 清楚
"With the drizzle, the trees in the little clearing had lost definition." (Anthony Hyde) 绵绵细雨中, 小小垦拓地内的树林已不再清晰可见
c. 限定
the definition of a President's authority总统的权限
4 a. 解晰; 鲜明; 显像
b. 解晰度; 鲜明度; 显像度; 清晰度
<<形容词>>
def.i.ni.tion.al