
algebra 
a form of elementary mathematics, used esp. in solving equations, in which letters stand for unknown or variable quantities. [1/2 definitions] 
algebraic fraction 
a fraction that has at least one algebraic variable or expression in the numerator or denominator, such as 1/x. 
Betelgeuse 
a red variable star in the constellation Orion, having a magnitude of 0.7. 
Cetus 
an autumn constellation in the northern sky, located below Pisces and Aries and containing the variable star Mira. 
changeable 
capable of changing; likely to change; variable; inconstant; fickle. [1/2 definitions] 
choppy 
of the wind, shifting unexpectedly; variable. [1/3 definitions] 
covariance 
in statistics, a measure of how two variables are related, equal to the product of the deviation of each variable from its mean. In positive covariance, the two variables (such as temperature and air conditioner use) are directly related and follow the same trend. In negative covariance, the two variables (such as temperature and heater use) are inversely related and follow opposite trends. 
curve 
a line graph that represents a single variable affected by changing conditions. [1/7 definitions] 
differential 
in mathematics, a function that expresses the incremental increase of another function as a variable increases, and that can be used to calculate slopes, curves, accelerations, and the like. [1/8 definitions] 
doldrums 
the ocean belt near the equator, characterized by calms and light, variable winds, or the characteristic weather of this region. [1/2 definitions] 
exponential 
in mathematics, of or concerning an exponent, or having a variable in one or more exponents. [1/2 definitions] 
fickle 
quickly changing without reason or warning, esp. in affection or allegiance; variable or capricious. 
frequency distribution 
a table of statistical data in which the observed values of a variable are grouped into classes, and the frequencies for each class are given. 
gradient 
in physics, a measure of the greatest rate by which a variable, such as pressure or temperature, changes with a change in position. [1/4 definitions] 
graph 
a diagram that expresses a relationship between two or more variable quantities or factors by lines, bars, dots, or the like. [1/5 definitions] 
histogram 
a bar graph of a frequency distribution in which the frequency of a variable is represented by the height of the bar, and the class interval by the width, where each class interval is a summary of data that represents a range of independent variable values rather than a single value. 
inconsistent 
not following a regular pattern; variable. [1/2 definitions] 
independent variable 
a mathematical variable in a functional relationship, whose value may change independently of the value of other variables. 
line graph 
a graph that plots the relationship between two variable quantities, represented on horizontal and vertical axes, by connecting their coordinate points with straight lines. 
live load 
any variable weight added to the intrinsic weight of a structure, such as people in a building or moving traffic on a bridge. (Cf. dead load.) 
Mira 
a red variable star in the constellation Cetus, having a widely fluctuating magnitude between 2.0 and 10.0. 

