I see a lot of the word \'expressiveness\' when people want to stress one language is better than the other. But I don\'t see exactly what they mean by it.
Take for example LINQ. It allows you to use functional programming.
Functional programming emphasizes the application of functions, in contrast to the imperative programming style, which emphasizes changes in state.
LINQ allows your to express what you want done instead of how to do it. This is a clear example os expressiveness.