Anonymous "the navel of the world That might be used fancifully for a place, but it will not work in other cases. You will need to supply more context. Without it, I can only suggest 'key' or 'fundamental' as possibilities.
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Anonymous"the navel of the worldThat might be used fancifully for a place, but it will not work in other cases. You will need to supply more context. Without it, I can only suggest 'key' or 'fundamental' as possibilities.