dependent value	a value or variable that depends upon the independent value
discrete values	values that change in increments (not continuously)
domain	the set of all possible inputs of a function which allow the function to work
function	a kind of relation in which one variable uniquely determines the value of another variable
independent value	a value or variable that changes or can be manipulated by circumstances
input	the independent variable of a function—input determines output
output	the dependent variable of a function—output is determined by input
range	the set of all possible outputs of a function
relation	the relationship between variables that change together