1. A general idea or understanding of something: the concept of inertia; the concept of free will. See Synonyms at idea.
2. A plan or original idea: The original concept was for a building with 12 floors.
3. A unifying idea or theme, especially for a product or service: a new restaurant concept.
Having an experimental or strikingly different design, especially to test or demonstrate new features: a concept car.
[Late Latin conceptus, from Latin, past participle of concipere, to conceive; see CONCEIVE.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
The American Heritage Dictionary Blog
Check out our blog, updated regularly, for new words and revised definitions, interesting images from the 5th edition, discussions of usage, and more.