Resuscitation was the revival of someone from unconsciousness, or, in rare cases, death.
In 2259 of the alternate reality, Leonard McCoy used Khan Noonien Singh's blood to revive a dead tribble, and then James T. Kirk, who had died from radiation poisoning after reactivating the USS Enterprise's warp core. (Star Trek Into Darkness)
In 2267, Leonard McCoy was killed by a knight's lance, in an environment that created reality from people's thoughts. McCoy's resurrection was brought about by the power which created the knight in the first place, after Kirk realized what was occurring. (TOS: "Shore Leave")
When a young boy on Amerind was unconscious due to water inhalation, James T. Kirk managed to resuscitate him. Seeing as the Amerind inhabitants believed the boy to be dead prior to his resuscitation, they mistook Kirk for a deity. (TOS: "The Paradise Syndrome")
In 2285, Spock experienced death, but with his katra having been placed into Leonard McCoy and his body regenerated on the Genesis Planet, he was able to live again. (Star Trek III: The Search for Spock)
When Beverly Crusher found Clare Raymond, Ralph Offenhouse and L.Q. Clemonds frozen in cryogenic stasis, they were dead, but she was able to resuscitate them. Upon awakening, Raymond briefly went unconscious but was able to be resuscitated again. (TNG: "The Neutral Zone")
When Deanna Troi was under the effects of Ves Alkar's telepathic influence that was making her emotional, violent and causing her to age rapidly, Beverly Crusher saved her by killing her and then resuscitating her. (TNG: "Man of the People")
Prior to Neelix in 2374, nobody had ever been medically resuscitated eighteen hours after death, though according to Seven of Nine, the Borg had reactivated Borg drones as long as seventy-three hours after what would be called death. Species 149 were medically advanced and had the ability to reanimate the dead. They were assimilated by the Borg, allowing the Borg to reanimate a drone as much as 73 hours after death. Neelix was also brought back from being dead using this technique after Seven of Nine proposed it as a medical treatment, but as his death did not match his culture's beliefs regarding an afterlife, he was profoundly disturbed by the experience. (VOY: "Mortal Coil")