What does undocking mean?
Undocking denotes the reversal of docking: the act, process, or event of separating something that had previously been joined to a station, spacecraft, vehicle, vessel, or other structure. As a noun, an undocking can refer to an entire operation, including the preparations, maneuvers, and moment of separation. As a verb, it describes a spacecraft or other object leaving its connection with a docking point. The term is most familiar in aerospace, where undocking is a carefully planned phase of a mission, but it also applies in maritime and transport settings. Its ordinary uses tend to be technical or reportorial rather than conversational, although writers sometimes employ it metaphorically to describe a withdrawal from a partnership or arrangement. Etymologically, undocking combines the prefix un-, meaning reversal or undoing, with dock, an English word for a harbor or docking place.
The act or process of undoing a dock connection or separating from a docked position.
"The scheduled undocking was postponed because of a communications problem."
Usually refers to a spacecraft, vessel, or vehicle separating from a station, dock, or other connected structure.
To separate from a dock, docking point, or object to which one was connected.
"The supply ship began undocking from the research station."
Often used intransitively in aerospace and maritime reports; it is less common in everyday speech.
The plural is grammatical but uncommon because the word usually describes a particular undocking operation or phase.
"The mission included two undockings from separate orbital platforms."
Docking brings two spacecraft together; undocking sends them on their separate paths.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does undocking come from?
The word dock descends from Old English docc, a term associated with a harbor or enclosed waters, and later acquired the broader sense of a place where vessels or vehicles are brought alongside for loading, servicing, or connection. English formed undock by adding the productive prefix un-, meaning the reverse or undoing of an action. The gerund undocking developed from this verb and became especially prominent in the language of spacecraft operations.
Related word forms
How undocking is actually used
The word is chiefly used in aerospace, maritime, transport, and technical contexts. It is also occasionally used metaphorically for withdrawal from an organization, agreement, or relationship, but that usage may sound formal or dramatic.
Easily confused with undocking
Docking joins a spacecraft, vehicle, or vessel to its counterpart or destination, whereas undocking reverses that connection.