A person or entity that gives or donates something, especially money to a cause or organization. The charity event was a success thanks to the generous contributions from each donator.
A person who provides an organ, tissue, or cells for medical transplantation. The kidney donator underwent extensive testing before the surgery.
Chemistry, physics: a substance, atom, or molecule that supplies electrons, protons, or other particles to another species. In the reaction, the metal complex serves as the electron donator.