The concept of free speech is unknown to them.
It is very difficult to define the concept of beauty.
I failed to grasp the film's central concept.
The concept of democracy emphasizes the importance of individual freedoms and equal representation.
In physics, the concept of relativity revolutionized our understanding of space, time, and gravity.
The marketing team brainstormed creative concepts for the new advertising campaign to make the product more appealing to consumers.
The novel's central concept explores the complexities of human relationships in a futuristic society.
