形容詞 practicable:

1. usable for a specific purpose
   同義詞：operable
2. capable of being done with means at hand and circumstances as they are
   同義詞：feasible, executable, viable, workable

1. His plan seemed to be too difficult, but before long it proved to be practicable.
   他的計(jì)劃看起來太困難，但是沒多久就被證明很實(shí)用。
2. The mountain route is practicable only in summer.
   只有在夏季那條山路才可以通行。
3. That suggestion sounds practicable.
   那條建議聽起來可行。

prac.ti.ca.ble

adj.（形容詞）
Capable of being effected, done, or put into practice; feasible.See Synonyms at possible
可實(shí)用的，行得通的：能實(shí)行、能做到或可應(yīng)用的；可行的參見 possible
Usable for a specified purpose:
實(shí)用的，適用的：能實(shí)際使用的：
例句：
a practicable way of entry.
實(shí)用的入口

來源：
Medieval Latin practic3bilis [capable of being used]
中世紀(jì)拉丁語 practic3bilis [能用的]
from practic3re [to practice]
源自 practic3re [實(shí)踐，實(shí)行]
from pr3ctica [practice]
源自 pr3ctica [實(shí)行]
from Late Latin pr3cticô [practical as against contemplative life]
源自 后期拉丁語 pr3cticô [與冥想的生活相對(duì)的現(xiàn)實(shí)生活]
from Greek praktikô [feminine of] praktikos [practical] * see practica
源自 希臘語 praktikô [] praktikos的陰性詞 [實(shí)際的，實(shí)用的] *參見 practica

【引伸】
prac.ticabil.ity
n.（名詞）
prac.ticably
adv.（副詞）
Practicable means .feasible. as well as .usable.and hence overlaps in meaning to some extent withpractical, which can mean .useful.. However,practicable does not share any other senses with practical.
Practicable 意為.可行的.， 也有.可用的.之意，所以在意義上與意為.有用的.practical 有一定程度的重疊。 然而，practicable 與 pratical 沒有其他意義的重合