April       
noun [ C or U ] uk/ˈeɪ.prəl/ us/ˈeɪ.prəl/ (written abbreviation Apr.)
A1 四月
the fourth month of the year, after March and before May
  We came back in April. 我们是4月份回来的。 
 The meeting is on 4 April. 会议在4月4日举行。 
 I haven't seen her since last April. 我从去年四月开始就没有见过她。 
 - More examples
 - Her birthday is in April.
 - There is still snow on the ground here in April.