Byung-ryul Ryu. 2009, On the conjunction of ‘-(i)na -((i)na)’ in Korean. Korean Semantics, 29. This paper will be concerned with the syntactic distribution and the semantic interpretation of the disjunction ‘-(i)na’ in Korean. The disjunction ‘-(i)na’ is basically interpreted as a Boolean disjunction, but when looking at uses of ‘(i)na’ in everyday life, it seems that the word ‘-(i)na’ rarely ever exhibits this pure meaning. There is more often an “free choice” interpretation which is similar to conjunction than a Boolean disjunction one. The disjunction ‘-(i)na’ in Korean is morphologically divided into a parallel construction ‘A(i)na B(i)na’ and a series construction ‘A(i)na B’. This paper examines the proof by examine previous research(such as Kim Suk Deuk (1995), Hur Woong (1995), Yoon Jae-Hak (2000), Fox (2006)) and then searching for the Sejong Corpus. First, the series construction will be distinguished from the parallel construction in surface representation, and then the syntactic environment will be considered. Unless a ‘logical operator’ intervenes in a series construction, the ‘ignorance(or indifference) inference’, the ‘quantity implicatures’ and the ‘arbitrary choice’ interpretations can appear. This search for logical operators which have yet to be studied in previous research may yield an explanation for the ‘-(i)na’ conjunction construction. Also through examining statistical data, operators found to be connected with conjunction particle ‘-(i)na’ will provide a basic framework for discourse analysis and computational linguistics.