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decimal (adj.)

c. 1600, "pertaining to a tenth or ten," from Medeival Latin decimalis "of tithes or tenths," from Latin decimus "tenth," from decem "ten" (from PIE root *dekm- "ten"). Applied to Arabic notation before modern use in reference to decimal fractions (fraction whose denominator is a power of 10) emerged 1610s. As a noun from 1640s, "a decimal fraction." Decimal point is by 1711; the use of the point seems to be due to Scottish mathematician John Napier, "Marvellous Merchiston," c. 1619..

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Definitions of decimal from WordNet
1
decimal (n.)
a proper fraction whose denominator is a power of 10;
Synonyms: decimal fraction
decimal (n.)
a number in the decimal system;
2
decimal (adj.)
numbered or proceeding by tens; based on ten;
the decimal system
Synonyms: denary
From wordnet.princeton.edu