What is the meaning of Docking?

present participle and gerund of dock

The process of cutting off or trimming the tail or ears of an animal.

The securing of a vessel to the quayside with cables.

The process of connecting one spacecraft to another.

The sex act involving two men co-joined by their penises, with overlapping foreskins.

A method which predicts the preferred orientation of one molecule to a second when bound to each other to form a stable complex.

Source: wiktionary.org