Definition & Meaning of "necro"in English

What does "to necro" mean in gaming slang?

It is used to describe using necromancy or bringing something back from the dead, such as reviving fallen allies, summoning undead minions, or resurrecting a defeated boss or mechanic. Players typically use the term when playing classes like necromancers or death knights in role playing games, or when a game feature allows reanimation of corpses. The term originated as a shortening of "necromancy" in early role playing games like "Diablo" and "Dungeons & Dragons" based video games during the 1990s, where players would "necro" enemies back to fight for them.