To give money or goods for a good cause, for example to a charity. She decided to donate a portion of her salary to the local animal shelter.
To allow the removal of (blood, an organ, tissue, etc.) from one’s body so that it can be used in medical treatment for someone else. After the accident, he agreed to donate a kidney to his twin brother.
Chemistry: to supply (electrons, a lone pair, or other particles) to another atom or molecule during a chemical reaction. In the coordination complex, the amine group donates a pair of electrons to the metal center.