circumstantially UK /səː.kəmˈstæn.ʃə.li/US /sɝ.kəmˈstæn.ʃə.li/ adverb3 •in a circumstantial manner •In respect to circumstances; not essentially; accidentally.Of the fancy and intellect, the powers are only circumstantially different. — 1665 •In every circumstance or particular; minutely.To set down somewhat circumstantially, not only the events, but the manner of my trials. — 1665 formsmore circumstantially · most circumstantially