(1):

(a.) Abounding with circumstances; detailing or exhibiting all the circumstances; minute; particular.

(2):

(a.) Consisting in, or pertaining to, circumstances or particular incidents.

(3):

(a.) Incidental; relating to, but not essential.

(4):

(n.) Something incidental to the main subject, but of less importance; opposed to an essential; - generally in the plural; as, the circumstantials of religion.