1.NounA state of minimum power consumption, inactivity and metabolic depression in some animals during winter.
"The bears are in hibernation.; The bears come out of hibernation in March."
2.NounA hypothetical state of minimum power consumption, inactivity and metabolic depression in humans during long space flights.
3.NounA standby state which conserves power by writing the contents of the memory to disk and completely power off the computer, in order that one will resume the session from the disk.