circumstantial (adj) – belonging to, consisting in, or dependent on circumstances
BREAKDOWN: CIRCUM- (around) + STAN- (to stand) + -IAL (pertaining to)
— circumstance is the existing conditions or state of affairs surrounding and affecting a situation or agent
— to circumstantiate means to verify or give detailed proof
This word is built on the root CIRC-, which means about, around, or round.
Common CIRC- words include circle, circumference, and circus.
More esoteric CIRC- words include circumlocution, circumnavigate, and circumvolve.