粵典 (words.hk)香港詞
幫某啲嘢落定義；決定某啲嘢係唔係屬於某個範圍 (to define; to delimit)
動詞用例
如果條法例冇界定清楚，就好容易令人有機可乘。
jyu4 gwo2 tiu4 faat3 lai6 mou5 gaai3 ding6 cing1 co2, zau6 hou2 jung4 ji6 ling6 jan4 jau5 gei1 ho2 sing4.
If the law don't have a clear definition, there will be a loophole that can be used.