What's the difference between circumambiency and circumambient?

Circumambiency

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Definition:

• (n.) The act of surrounding or encompassing.

Example Sentences:

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

Circumambient

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Definition:

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

Example Sentences:

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