"proportional" - key terms from Wikipedia

approximately proportional
cox proportional	hazards model
density proportional
directly proportional
energy is proportional
inversely proportional
inversely proportional	to the square
logarithmically proportional	to the number
mixed member proportional
mixed member proportional	representation
proportional
proportional	assist ventilation
proportional	band
proportional	change
proportional	counter
proportional	fonts
proportional	gain
proportional	hazards
proportional	hazards model
proportional	hazards models
proportional	policy
proportional	reinsurance
proportional	representation
proportional	response
proportional	spacing
proportional	tax
proportional	term
proportional	to labor
proportional	to the applied force
proportional	to the area
proportional	to the current
proportional	to the gradient
proportional	to the product
proportional	to the square
proportional	vigorish
roughly proportional
space proportional