inbirth means an inner or inward birth. Lexicurio rates it Sui generis — a strength score of 88 out of 100.
Why “inbirth” is a great word
INBIRTH — [Noun] An inner or inward birth; a native or innate quality or condition. From the English prefix in- (meaning "in, within") + birth. Unlike "inborn," which describes a trait present from physical arrival, or "nativity," which concerns the literal circumstances of emergence, inbirth denotes a metaphysical genesis, the forging of a self from within. It is the quiet, cellular awakening of a conscience, the sudden flowering of a talent from untraceable roots, or the slow crystallization of a sorrow seeded long before it is understood—the soul's own silent labor of continual becoming.
Etymology
From in- + birth. Compare Old English inberþ, inbyrd (“born within one's estate; native-born”).
noun
- An inner or inward birth“My dear invisible Church (truly invisible, even to its pastor, as I never set eyes on one of you)-my dear Church, I'll let you into a secret—I am no mystic; I never in my life was in a “high sphere," and never experienced an “inbirth."”