The process by which something is undocked; removal from a dock.(noun)
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Use "undocking" in a sentence
""It gives us two extra days of six people, which is a lot of crew time to get all that stuff or some of it done, before they leave and then it just helps maximize our time post undocking for things like science and other activities we have to perform on board the Space Station on a daily basis," said Kelly."
"The journey was replete with nostalgic moments: the final use of the shuttle's robotic arm, the final undocking from the space station, the final satellite launched into orbit."
"But the Soyuz won't be able to immediately return to its port if there is trouble sealing the hatch, which normally is closed prior to undocking."