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The Collaborative International Dictionary
circumstant

circumstant \cir"cum*stant\ (s[~e]r"k[u^]m*st[a^]nt), a. [L. circumstans. See Circumstance.] Standing or placed around; surrounding. [R.] ``Circumstant bodies.''
--Sir K. Digby.

Wiktionary
circumstant

a. Standing or placed around; surrounding.