Where does “अनिर्वाण” come from?

अनिर्वाण (Sanskrit) comes from Sanskrit निर्वाण, from Sanskrit निस्, from Sanskrit नि, from Proto-Indo-Iranian ní, from Proto-Indo-European ni — down.

Ancestry of “अनिर्वाण”, step by step

StepLanguageWordMeaning
1Sanskritनिर्वाणblowing out, extinction, cessation, setting,...
2Sanskritनिस्out, forth, away &c
3Sanskritनिdown; back; in, into
4Proto-Indo-Iraniannídown, downwards; in, into
5Proto-Indo-Europeannidown
Every word from Proto-Indo-European ni →Every word from Proto-Indo-Iranian ní →Every word from Sanskrit नि →