1. decide against or choose not to do something
To reject something means to dismiss or refuse to accept something usually on the grounds that it is faulty or because it is not of a good enough standard. To reject something can mean to refuse to agree, such as rejecting an idea or rejecting a proposal. To reject a person is to fail to show affection or emotion towards someone. Medically, to reject something is to have an immune response where the body reacts to a transplant, tissue or implated or artificial devise so that it fails to work. As a noun, a reject is something or someone which is dismissed as inadequate or unacceptable or a production item which is sold at a reduction because of flaws in manufacturing.
I reject the idea that shared work space leads to less productivity.
My application to the university was unfortunately rejected.