(equal) difference; common difference
Used in mathematics and formal contexts to refer to a constant difference between terms in an arithmetic progression or a graded scale. Not an everyday word for 'difference'.
In an arithmetic progression, the difference between consecutive terms is constant; this is called the common difference.
The common difference of this sequence is 3.
arithmetic progression; arithmetic sequence
arithmetic series
Compound of 等 (equal) and 差 (difference). The term is primarily used in mathematical contexts.