noun.
Something incidental to the main subject, but of less importance; opposed to an essential; -- generally in the plural.
adjective.
Consisting in, or pertaining to, circumstances or particular incidents.
adjective.
Incidental; relating to, but not essential.
adjective.
Abounding with circumstances; detailing or exhibiting all the circumstances; minute; particular.
adjective.
evidence obtained from circumstances, which necessarily or usually attend facts of a particular nature, from which arises presumption. According to some authorities circumstantial is distinguished from positive evidence in that the latter is the testimony of eyewitnesses to a fact or the admission of a party; but the prevalent opinion now is that all such testimony is dependent on circumstances for its support. All testimony is more or less circumstantial.