notion

观念，信念，理解

a political system based on the notions of equality and liberty.

建立在自由平等观念上的政治体系

I have to reject the notion that the greed can be a good thing.

我不能接受那种认为贪婪也可以是件好事的想法。

She had only a vague notion of what might happen.

对于可能发生的事，她只有一个模糊的概念。

notional adj. 猜测的，估计的，理论上的，想象的