What's the difference between circumambient and jactation?

Circumambient

Definition:

• (a.) Surrounding; inclosing or being on all sides; encompassing.

Example Sentences:

• (1) It had infiltrated the circumambient endometrium slightly.

Jactation

Definition:

• (n.) A throwing or tossing of the body; a shaking or agitation.

Example Sentences: