Definition of decreasing in English:
 decreasing
adjectivedɪˈkriːsɪŋdəˈkrisɪŋ
Becoming smaller or fewer in size, amount, intensity, or degree.
 the affair attracts a decreasing number of visitors
noundɪˈkriːsɪŋdəˈkrisɪŋ
mass nounThe action or process of making or becoming smaller or fewer.
 the decreasing of greenhouse gases would also lead to an avoidance of a temperature rise
  Definition of decreasing in US English:
 decreasing
adjectivedəˈkrisɪŋdəˈkrēsiNG
Becoming smaller or fewer in size, amount, intensity, or degree.
 the affair attracts a decreasing number of visitors
noundəˈkrisɪŋdəˈkrēsiNG
The action or process of making or becoming smaller or fewer.
 the decreasing of greenhouse gases would also lead to an avoidance of a temperature rise