Meaning

noun a seasonal wind in southern Asia; blows from the southwest (bringing rain) in summer and from the northeast in winter

noun rainy season in southern Asia when the southwestern monsoon blows, bringing heavy rains

noun any wind that changes direction with the seasons

originBorrowed from Portuguese monção and Dutch moesson, from Arabic مَوْسِم (mawsim, “season”), from وَسَمَ (wasama, “to mark, to brand”).

Etymology from Wiktionary, CC BY-SA 3.0