From Urdu _بیگم_ and Hindi _बेगम_ (begam, “lady”), from East Turkic _begüm_
Beg (A provincial governor under the Ottoman Empire, a bey)+ um (feminine suffix for nobility titles) Compare with خانم (hanım).
BEGUM (_plural_ BEGUMS)
* a high ranking Muslim woman, especially in India and Pakistan
* 2012, The Economist, _Bangladesh: Out of the basket_
[..] toxic politics dominated by the bitter infighting of the “battling BEGUMS” (the widow and daughter of former presidents, who lead the two main parties).
* the form of address for such a woman