Conceptual (adjective)

1. Relating to concepts or ideas.
2. Relating to the mental process of forming concepts.

Origin:

From the latin word "conceptus" meaning "something that is conceived" or "thought of".

Examples:

1. The artist's work is highly conceptual.
2. The book is about the conceptual foundations of mathematics.
3. The project is in its conceptual stage.
4. The class is focused on conceptual understanding of the material.
5. The advertising campaign was based on a conceptual theme.