concept

noun

• an abstract idea; a general notion:structuralism is a difficult concept the concept of justice
• a plan or intention; a conception:the center has kept firmly to its original concept
• an idea or invention to help sell or publicize a commodity:a new concept in corporate hospitality
• Philosophy an idea or mental picture of a group or class of objects formed by combining all their aspects.
• [as modifier] (of a car or other vehicle) produced as an experimental model to test the viability of new design features.