Webster's English Dictionary

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decimal

1. dec.i.mal \'des-*-m*l\ \-m*-le-\ aj [(assumed) NL decimalis, fr. ML, of 
   a tithe, fr. L decima tithe] : numbered or proceeding by tens :  : based on 
   the number 10  : subdivided into 10th or 100th units  : expressed in a 
   decimal fraction  - dec.i.mal.ly av
2. decimal n : a proper fraction in which the denominator is a power of 10 
   usu. not exp ressed but signified by a point placed at the left of the 
   numerator (as .2=2/10, .25=25/100, .025=25/1000)