"variable" - key terms from Wikipedia

bound variable
confounding variable
continuously variable	transmission
control variable
dependent variable
discrete random variable
environment variable
explanatory variable
external variable
free variable
global variable
hidden variable
hidden variable	theory
independent variable
loop variable
luminous blue variable
one variable
predictor variable
random variable
response variable
slack variable
unit variable	cost
variable
variable	annuities
variable	assignment
variable	bindings
variable	bitrate
variable	capacitors
variable	cost
variable	costs
variable	date
variable	domain
variable	fighter
variable	geometry
variable	geometry turbocharger
variable	input
variable	inputs
variable	length
variable	length intake manifold
variable	names
variable	rate
variable	resistor
variable	speed
variable	speed limits
variable	star
variable	stars
variable	turbine geometry
variable	universal life
variable	valve
variable	valve timing