Sacrifice

A sacrifice is an offering of food, an object, animals, or a person to something. In some cases it involves a person giving their life for a greater good.

History
Storm almost sacrificed herself to stop some nuclear missiles but Professor X gave her a way to stop them without killing herself.

Lady Dorma sacrificed herself to save Namor from Krang, though she was later resurrected.

Doctor Octopus felt that sacrifices must be made in the name of science. He took this to mean he could kill Felicia Hardy to achieve his goals.

Eddie Brock sacrificed himself to stop Dormammu and Carnage.

Spider-Carnage sacrificed himself to stop the Carnage symbiote.

Silver Surfer sacrificed his life as the Herald of Galactus to save Earth.