Definition

1. Noun:
   • A digit from 0 to 9 in decimal notation: A decimal digit is any one of the ten numerical symbols (0, 1, 2, 3, 4, 5, 6, 7, 8, 9) used in the base-10 numbering system, which is the standard system for denoting integer and non-integer numbers.

Usage

• The term is used to specify a single character within a decimal number. It distinguishes these digits from digits used in other numeral systems (like binary digits, or bits, which are 0 and 1).
• It is commonly used in mathematics, computer science, and data processing contexts.

Examples

• Noun:
  • The number 437.15 contains five decimal digits: 4, 3, 7, 1, and 5.
  • Please enter a four-decimal-digit PIN code.
  • In computing, a single decimal digit can be represented using four binary digits (bits).

Advanced Usage

• Positional Value: In a decimal number, the value of a depends on its position. For example, in the number 555, the leftmost digit represents five hundreds, the middle represents five tens, and the rightmost represents five ones.
• Significance in Data Types: In programming, data types like or are defined to store numbers with a fixed number of decimal digits before and after the decimal point to ensure precision.

Variants and Related Words

• Digit (n): Any single numerical symbol from 0 to 9, or in other bases (e.g., a hexadecimal digit can be 0-9 or A-F).
• Decimal (adj): Relating to the base-10 number system.
  • The decimal system is the most common number system used by humans.
• Decimal point (n): The dot used to separate the integer part from the fractional part in a decimal number.
• Decimal place (n): The position of a digit to the right of the decimal point.

Synonyms

• Numerical digit: A more general term for a single symbol in any numeral system.
• Arabic numeral: Refers specifically to the ten symbols (0-9) used in the decimal system, distinguishing them from Roman numerals (I, V, X, etc.).

Related Phrases

• Most significant digit (MSD): The leftmost, non-zero digit in a number, which has the greatest value or weight.
  • In the number 0.00456, the most significant digit is 4.
• Least significant digit (LSD): The rightmost digit in a number, which has the smallest value or weight.
  • When rounding to two decimal places, you look at the third least significant digit.

Noun

1. a digit from 0 to 9 in decimal notation