a.

1. 附有條件的，以……為條件的[（+on/upon）]
   The sale of the painting was conditional on the expert's agreement that it was an original Rembrandt.

   這幅畫的出售須要有專家認可它確是倫勃朗的原作才行。

2. 【語】表示條件的
   "If we go" is a conditional clause.

   "要是我們去的話"是條件子句。

3. 【邏】有條件的

n.

1. 【語】條件句；條件語[C]

adj.

1. subject to one or more conditions being met.
2. Grammar  expressing a condition.

n.

1. Grammar  & Philosophy  a conditional clause or conjunction.
2. Grammar  the conditional mood of a verb, for example should in if I should die.