Creative // Imagination // Culture

These three words swim together rather nicely when tossed into a simmering pot filled with fresh cut taters and baby carrots. At first glance these words do seem to piece together quite perfectly, specifically "creative" and "imagination". "Culture", however, seems slightly outside of the circle, but subconsciously you understand where it fits into the mix.
When looking into the definitions of the words "creative" and "imagination" you can find that each word is used in the others description. This, I feel, is appropriate. My personal definition of these words, pretending I didn't look at any sort of reference, would be as follows:

"Creative" would be used to describe a set of ideals and thoughts being put together in a way or means that is not readily available in thought. It is something that combines many aspects and concepts in a manner that requires a step-by-step thought process. At times this is used to make stories or ideas that are not necessarily within reality, or are matters of art in whatever form.

"Imagination" is something that individuals have which uses creativity. Much like the above definition, it is ideals and concepts being constructed in non-conventional forms. Those who are creative have an imagination, the imagination is linked to one's creativity.

Now "Culture" is something that sort of consumes the previous words mentioned above. Imagination and creativeness are what make up a culture. A culture would be defined as the major, consistent forms of art that differentiate a set of people from another set of people. Our culture consists of certain films, stories, events, mythologies, heroes, villains, paintings, etc. No other culture has our specific blah, blah, blah. They have their own forms, and that makes up their culture. But our imagination and creativeness established in our culture is unique.

These are loose definitions that could use some major honing and chiseling; however, it's a start in the right direction. And, like what these words represent, the words themselves are not easily contained within single, simple summaries.