Final answer:
The projectability of turn completion refers to how participants in a conversation can predict when someone's speaking turn is about to end, enabling a smooth conversational flow.
Step-by-step explanation:
The term projectability of turn completion is a concept within the study of conversation analysis in the field of linguistics, which is closely related to social studies. This concept deals with the ability of participants in a conversation to anticipate when a speaker's turn at talk is coming to an end. The completion of a turn is a crucial moment because it signals the possibility for another speaker to take the floor without causing overlap or interruption. Participants rely on various verbal and non-verbal cues such as intonation, grammar, and pauses to project turn completion. Conversational analysts examine these factors to understand how people interact in smooth, coordinated exchanges during conversations.