Greek word
hypóstasis
ὑπόστασις
What it means
a setting under, i.e. concretely, essence, or abstractly, assurance
a setting under (support), i.e. (figuratively) concretely, essence, or abstractly, assurance (objectively or subjectively)
Where it comes from
from a compound of hypó (ὑπό) and hístēmi (ἵστημι)