This paper examines the definitions of connective endings in Korean dictionaries to discuss what kinds of semantic labels form a system, and whether there are any semantic labels that should be added, replaced, or deleted. The key points of the discussion are as follows: 1) The semantic labels for a cause, a reason, a basis, grounds, and a motive can be sufficiently represented by “cause” and “reason.” “Cause” and “reason” are further distinguished by associating them with events situated in time and the object of beliefs respectively. 2) Regarding temporal relations, the labels “precedence,” “succession,” and “consequence” are unified under the term “succession.” The labels “intention” and “desire,” related to a purpose, are replaced with “purpose.” 3) Concessive meanings are described as a composite of “condition and contrast” or “acknowledgment and contrast.” 4) Endings labeled as opposition, contradiction, confrontation, a contrast, or a difference are collectively represented by “contrast,” with detailed definitions appended afterward. 5) The major classification system includes “addition,” encompassing enumeration, a contrast, a same-event addition, and elaboration. 6) Selection is further divided into parallel selection and subordinate selection. The former is labeled with “choice,” while the latter is given a composite label of “comparison and proposal.” 7) The major classification system is expanded to include “background” and “manner”.