- the seasonal wind of the Indian Ocean and southern Asia, blowing from the southwest in summer and from the northeast in winter.
- (in India and nearby lands) the season during which the southwest monsoon blows, commonly marked by heavy rains; rainy season.
- any wind that changes directions with the seasons.
- any persistent wind established between water and adjoining land.
- a seasonal wind of S Asia that blows from the southwest in summer, bringing heavy rains, and from the northeast in winter
- the rainy season when the SW monsoon blows, from about April to October
- any wind that changes direction with the seasons
n.1580s, “trade wind of the Indian Ocean,” from Dutch monssoen, from Portuguese monçao, from Arabic mawsim “time of year, appropriate season” (for a voyage, pilgrimage, etc.), from wasama “he marked.” When it blows from the southwest (April through October) it brings heavy rain, hence “heavy episode of rainfall during the rainy season” (1747).
- 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.
- 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.
A wind system that affects large climatic regions and reverses direction seasonally.