Regeneration is a process of repair or renewal. Regenerating damaged tissue was an important field in medicine. In addition, regeneration was a natural activity undertaken by some species during their resting cycle, analogous to sleep.
Regeneration in medicine
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Regeneration as a natural characteristic
Borg drones regenerated in Borg alcoves. Borg alcoves were used on the USS Voyager to allow Seven of Nine to regenerate. Later, they were also used by the Borg children and adolescents that joined the crew. (VOY: "The Haunting of Deck Twelve")
Borg drones could also regenerate and repair damage to a Borg ship, such as a Borg cube or a Borg sphere from the alcoves. (TNG: "Q Who"; VOY: "Dark Frontier") (The effect of the Borg cube's regeneration in Q Who was created by building a scale replica of a Borg cube's 'wall', melting it with a blowtorch, and then playing the footage in reverse during filming).
After Odo (serving as umpire) called a strike in a baseball game between the Niners and the Logicians, Benjamin Sisko claimed that Odo must have been regenerating and not watching the game at all. (DS9: "Take Me Out to the Holosuite")