Meaning

noun a woman religious

noun a buoy resembling a cone

noun the 14th letter of the Hebrew alphabet

originFrom Middle English nonne, nunne, from Old English nunne (“nun”), from Late Latin nonna (“nun, tutor”), originally (along with masculine form nonnus (“man”)) a term of address for elderly persons, perhaps from children's speech, reminiscent of nana, like papa etc. Doublet of nonna.

Etymology from Wiktionary, CC BY-SA 3.0