edition                
noun [ C ] uk/ɪˈdɪʃ.ən/ us/ɪˈdɪʃ.ən/
B2 版本
a particular form in which a book, magazine, or newspaper is published
  the paperback/hardback edition of the dictionary 该词典的平装/精装本 
 The regional editions of the paper contain specific information for that area. 该报地方版刊登一些专门面向那个地区读者的内容。 
  (广播电视节目的)一期,一辑
a single broadcast of a series of radio or television programmes
  This morning's edition of 'Women's Hour' is at the earlier time of a quarter to ten. 今天上午的《妇女时光》节目将提前到9点45分播出。 
  一版印刷总数;版次
the total number of copies of a particular book, newspaper, etc. that are published at the same time
  She collects first editions of 19th-century authors. 她收藏19世纪作家著作的初版本。 
  US(一系列重复进行的事件中的)一次,一回,一届 
one of a series of repeated events
  The 77th edition of the Indianapolis 500 was held before an estimated 450,000 fans. 第77届印第安纳波利斯500英里汽车赛吸引了大约45万车迷观看。 
 - More examples
 - All citations are taken from the 1973 edition of the text.
 - The revised edition of the book includes many useful annotations.
 - Teaching posts are advertised in Tuesday's edition of the paper.
 - Tomorrow's edition will include a centre-spread on the Spanish royal family.
 - I've only read the abridged edition of her novel.