the season of heavy rainfall in southeast Asia, especially India and neighbors between May and September, caused by a particular wind blowing in from the southwest;
e.g. The farmers waited for the monsoon to bring relief from the drought.
(noun)
a seasonal wind that blows over the Indian Ocean and parts of south/southeast Asia, coming from the southwest or the northeast depending on the time of year;
e.g. They were able to map the monsoon and predict when the rainy season would begin.