Webster's English Dictionary

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diminution

dim.i.nu.tion \.dim-*-'n(y)u:-sh*n\ n [ME diminucioun, fr. MF diminution, 
   fr. ML diminution-, di]minutio, alter. of L deminution-, deminutio, fr. 
   deminutus, pp. of deminuere : the act, process, or an instance of 
   diminishing : DECREASE