A repeating decimal is a number expressed in decimal form in which, after a finite number of miscellaneous digits, the number continues with a string of a finite number of digits which repeats itself without end.
That's an irrational number.
That is the definition of a rational number.
A decimal with a continuously repeating digits or group of digits
If you mean a recurring or repeating decimal it's for example 2/3 = 0.666666 .... recuring 6
No. 125 is not repeating decimal.
0.370 repeating is a decimal.
1.21 repeating ... is a decimal.
3.25 repeating ... is a decimal.
4.23 repeating is a decimal.
0.45 repeating is a decimal!
3.66 repeating is a decimal.
0.7777 repeating is a decimal.