threading Syllabification: (thread·ing)Pronunciation: /ˈTHrediNG/Definition of threading noun 1a process in which unwanted facial hair is removed by using twisted cotton thread to pull the hair from the follicle. 2 Computing the system by which consecutive messages relating to a single subject on a message board or newsgroup are stored for retrieval. threading in other Oxford dictionaries Definition of threading in the British & World English dictionary