khalaf (al_ _) khalifah (pl. khulafaa')

Librarian.

khalaf (al_ _) الخلف
succeeding generation(s)
The generations that came later.

[1] khalifah (pl. khulafaa') (خليفة (خلفاء [1]
caliph, successor
Originally, someone who succeeded the Prophet ( Sallalahu aleihi wa

). later it came to be used to refer to all the heads of the Islamic State until the last Ottoman ruler.

[2] khalifah (pl. khulafaa') (خليفة (خلفاء [2]
vicegerent, viceroy
In the Quran, the term is used to refer to a vicegerent, someone who rules on eareth, so to speak, on behalf of Allah. So Adam wa made a ''khalifah''. (See the Quran, 2: 30). And so was David (See the Quran, 38: 26).

khalifah (al_ _) ar-raashid الخليفة الراشد
the righteous caliph
The righteous successor to the Prophet ( Sallalahu aleihi wa

), Abu bakr al-Siddiiq or any of his three successors. (See ''al-khulafaa' ar-raashiduun'').