1
Stage 1 of 2
obsidere
Latin · ancient
"to besiege"
to besiege, from ob- (against) and sedere (to sit)
2
Stage 2 of 2
obsession
English · 1500s
"a persistent, intrusive preoccupation with something"
broadened from being besieged by a hostile spirit to a persistent, intrusive preoccupation
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