idea 最普通常用词，几乎适用于任何方面的思维活动。
concept 指从众多实例中通过概括、归纳而形成的对事物本质、全貌及其内部联系的概念或看法。
concept ion通常指个人或一些人所持有的具体概念或念头，也可指概念的形成过程，含一定的想象和感情色彩意味。
thought 指以推理、思考等智力活动为基础的心理思维活动及其结果。
notion 指的是一种模糊的，变化的莫测的想法，无可靠的基础，未经深思熟虑的观点。
impression 指外部刺激在思想中所产生的印象。
参考例句
1. As an exception I accept all his concepts and conception except one. 作为例外，我接受他所有的概念和构想，只有一个除外。
2. Everyone has his own conception of happiness, and different people holds different understanding of happiness. 每个人都有他自己的幸福观念，不同的人对幸福有不同的理解。
3. We need fathers to understand that their work does not end with conception-what truly makes a man a father is the ability to raise a child and invest in that child. 我们需要父亲们带头这样一种观念，真正使男人成为父亲的是能够培养孩子并投入孩子的生活中，使他们了解到他们的工作还没有结束。
英英解释
n.
1. an abstract or general idea inferred or derived from specific instances
2. the act of becoming pregnant; fertilization of an ovum by a spermatozoon
3. the event that occurred at the beginning of something
4. the creation of something in the mind
