The word(s) "solitude" appears 2 time(s) in 2 verse(s) in Quran in Muhammad Pickthal translation.

(1) And when We did appoint for Moses forty nights (of solitude), and then ye chose the calf, when he had gone from you, and were wrong-doers.

(2) And when We did appoint for Moses thirty nights (of solitude), and added to them ten, and he completed the whole time appointed by his Lord of forty nights; and Moses said unto his brother, Aaron: Take my place among the people. Do right, and follow not the way of mischief-makers.