What is the meaning of Cascade in bengali?

Meaning(s):

1. a small waterfall or series of small waterfalls
2. a succession of stages or operations or processes or units
3. a sudden downpour (as of tears or sparks etc) likened to arain shower
4. rush down in big quantities, like a cascade
5. arrange (open windows) on a computer desktop so that they overlap each other, with the title bars visible
6. सोपानी पात A cascade of golden hair fell down his back.
7. जलप्रपात (a small waterfall, especially one of several falling down a steep slope with rocks)
8. प्रपात के रूप में गिरना Water cascaded down the mountainside.