i Register
In some senses, extrinsical is marked as obsolete, rare. Watch for register when choosing this word.
adj
Extrinsic.
A body cannot move, unless it be moved by some extrinsical agent: we may easily frame a conceit, how absurd it is to think that a body, by a quality in it, can work upon itself.
Neither is the atom by any extrinsical impulse diverted from its natural course.
noun
Something that is extrinsic.