The Collaborative International Dictionary
Circumstantiate \Cir`cum*stan"ti*ate\, v. t. [imp. & p. p. Circumstantiated; p. pr. & vb. n. Circumstantiating.]
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To place in particular circumstances; to invest with particular accidents or adjuncts. [R.]
If the act were otherwise circumstantiated, it might will that freely which now it wills reluctantly.
--Bramhall. -
To prove or confirm by circumstances; to enter into details concerning.
Neither will time permint to circumstantiate these particulars, which I have only touched in the general.
--State Trials (1661).
Wiktionary
vb. (en-past of: circumstantiate)