article in its definition

0The online dictionary from Naver.co.kr had this definition of 'diminution': 02br
02br
00N-UN05200 : 05300u N 05400/05500 n02br
00A 01b05602b00 05700 05800 05900 051000 051100 051200 051300, 051400, 051500 05160517051800y.00[ 051900 ]02br
050052000 a 052100 052200 052300 052400 052500.02br
051052602br
02br
02br
00Why the definition has the article 'A' in its definition and its example phrase when it is noted as an uncountable noun, which a notation that seems to indicate the usually occuring position of 01i00Noun of noun02i00 or 01i00Noun in noun02i00? 030srchttp://sstatic.naver.com/eedic/images/bu_tr13.gif31srchttp://sstatic.naver.com/eedic/images/blt_synm.gifw11h11252hrefjavascript:flink("COUNT")cCOUNT253hrefjavascript:flink("us")cus254hrefjavascript:flink("of")cof255hrefjavascript:flink("in")cin256hrefjavascript:flink("diminution")cdiminution257hrefjavascript:flink("of")cof258hrefjavascript:flink("something")csomething259hrefjavascript:flink("is")cis2510hrefjavascript:flink("its")cits2511hrefjavascript:flink("reduction")creduction2512hrefjavascript:flink("in")cin2513hrefjavascript:flink("size")csize2514hrefjavascript:flink("importance")cimportance2515hrefjavascript:flink("or")cor2516hrefjavascript:flink("in")cin2517hrefjavascript:flink("ten")cten2518hrefjavascript:flink("sit")csit2519hrefjavascript:flink("FORMAL")cFORMAL2520hrefjavascript:flink("despite")cdespite2521hrefjavascript:flink("slight")cslight2522hrefjavascript:flink("diminution")cdiminution2523hrefjavascript:flink("in")cin2524hrefjavascript:flink("asset")casset2525hrefjavascript:flink("value")cvalue2526hrefjavascript:flink("reduction")creduction