IPA: /ˌɪməˈleɪʃən/
KK: /ɪˈmoʊleɪʃən/
The act of killing or destroying something, often as a sacrifice.
The ancient ritual involved the immolation of offerings to the gods.
Immolation is formed from "in-" (meaning not) and "molare" (meaning to grind or crush). The word originally referred to the act of grinding or crushing something, but in a more specific context, it has come to mean the act of sacrificing or offering, often by fire.
Think of 'not grinding' ('in-') something down, but instead offering it up as a sacrifice, which is what immolation means.