"variable" - key terms from Wikipedia

abstract variable
auxiliary variable
cepheid variable
continuously variable	transmission
control variable
dependent variable
discrete random variable
each variable
environment variable
global variable
hidden variable
hidden variable	theory
independent variable
instance variable
local 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	bit rate
variable	bitrate
variable	capacitor
variable	cost
variable	costs
variable	cylinder management
variable	data
variable	domain
variable	fighter
variable	geometry
variable	input
variable	inputs
variable	length
variable	name
variable	names
variable	rate
variable	region
variable	resistor
variable	speed
variable	speed limits
variable	star
variable	stators
variable	valve
variable	valve timing