- The observations gathered from an expreiment, survey or observational study. Often the data are a randomly selected sample from an underlying population.
- Statistics or other information represented in a form suitable for processing by computer.
A particular month, day, and year at which some event happened or will happen.
A period of ten years, especially a continuous period, such as 1910~1919 or 2009~2018.
A polygon with ten sides and ten angles.
A solid figure having ten plane faces.
A number written using the base 10.
decimal fraction 十进制分数，小数
A fraction whose denominator is some power of 10, usually indicated by a dot (decimal point or point) written before the numerator: as 0.4 = 4/10; 0.126 = 126/1000.
decimal point 小数点
A dot written in a decimal number, as in 8.6, to indicate the place where values change from positive to negative powers of 10.
dependent event 相关事件，相依事件
descending order 降序
difference of Squares 平方差
digital clock / digital watch 数字时钟
directed number 有向数
discrete data 离散数据
distributive law 分配律
domain of a function 函数的定义域