
Well, many pages have been written on the subject of how we acquire new words. It is proven that we learn them like in waves, like the ones you see when you throw a rock in a pond, gradually acquiring their semantic features.
Here is a link to start thinking about it. You'll find it under VOCABULARY.
And what about you? How do you learn new words? Do you learn them in the same way in your first and second language? Do you have any tricks that you'd like to share?