[1] : The Collaborative International Dictionary of English v.0.48

decimal \dec"imal\, a. f. d'ecimal cf. ll. decimalis, fr.
   l. decimus tenth, fr. decem ten. see ten, and cf. dime.
   of or pertaining to decimals; numbered or proceeding by tens;
   having a tenfold increase or decrease, each unit being ten
   times the unit next smaller; as, decimal notation; a decimal
   coinage.
   1913 webster

   decimal arithmetic, the common arithmetic, in which
      numeration proceeds by tens.

   decimal fraction, a fraction in which the denominator is
      some power of 10, as 2/10, frac25x100, and is usually
      not expressed, but is signified by a point placed at the
      left hand of the numerator, as .2, .25.

   decimal point, a dot or full stop at the left of a decimal
      fraction. the figures at the left of the point represent
      units or whole numbers, as 1.05.
      1913 webster
see also:
ten dime decimal arithmetic decimal fraction decimal point 

Arithmetic >> A Words
Arithmetic, definition of term: Arithmetic
arithmetic_pag1.html

Decimal >> D Words
Decimal, definition of term: Decimal
decimal_pag1.html

Decimal System >> D Words
Decimal System, definition of term: Decimal System
decimal+system_pag1.html

Decimal Point >> D Words
Decimal Point, definition of term: Decimal Point
decimal+point_pag1.html

Decimal Fractio >> D Words
Decimal Fractio, definition of term: Decimal Fractio
decimal+fractio_pag1.html

Arithmetic Oper >> A Words
Arithmetic Oper, definition of term: Arithmetic Oper
arithmetic+oper_pag1.html