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mon·soon  (mn-sn)
1. A wind system that influences large climatic regions and reverses direction seasonally.
a. A wind from the southwest or south that brings heavy rainfall to southern Asia in the summer.
b. The rain that accompanies this wind.

[Obsolete Dutch monssoen, from Portuguese monção, from Arabic mawsim, season, from wasama, to mark; see wsm in Semitic roots.]

mon·soonal adj.

monsoon [mɒnˈsuːn]
1. (Earth Sciences / Physical Geography) a seasonal wind of S Asia that blows from the southwest in summer, bringing heavy rains, and from the northeast in winter
2. (Earth Sciences / Physical Geography) the rainy season when the SW monsoon blows, from about April to October
3. (Earth Sciences / Physical Geography) any wind that changes direction with the seasons
[from obsolete Dutch monssoen, from Portuguese monção, from Arabic mawsim season]
monsoonal  adj

monsoon  (mn-sn)
1. A system of winds that influences the climate of a large area and that reverses direction with the seasons. Monsoons are caused primarily by the much greater annual variation in temperature over large areas of land than over large areas of adjacent ocean water. This variation causes an excess of atmospheric pressure over the continents in the winter, and a deficit in the summer. The disparity causes strong winds to blow between the ocean and the land, bringing heavy seasonal rainfall.
2. In southern Asia, a wind that is part of such a system and that blows from the southwest in the summer and usually brings heavy rains.

monsoon  /mnsun/  n. 1 a heavy rain storm, esp. of southeast Asia: A monsoon struck the coastline. 2 a seasonal wind in southeastern Asia that changes direction: The monsoons from April to October bring rain to the area. monsoon

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