Rectilinear propagation is a wave property which states that waves propagate in straight lines. This property applies to both transverse and longitudinal waves.
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Pratiksha Pant answered this
When an Object moves in a straight line it is said to be in rectilinear motion. Whereas rectilinear propogation is exactly what 'Lucky Girl' has told. For e.g 1) A car moving in a straight line is said to be in rectilinear motion or propagation.
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Awani Kendurkar answered this
The phenomenon which tells us that light travels in straight line is called rectilinear propagation of light.