All 6 Uses

unprecedented
in
Another Country
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They strike one, above all, as giving no account of themselves in any terms already consecrated by human use; to this inarticulate state they probably form, collectively, the most unprecedented of monuments; abysmal the mystery of what they think, what they feel, what they want, what they suppose themselves to be saying.†
p. i.5

unprecedented = not having happened before; or nothing similar having happened before
Entirely alone, and dying of it, he was part of an unprecedented multitude.†
p. 4.7
She bent her head over her cocktail glass, disappearing for a moment, like some unprecedented turtle, behind the citadel of her hair.†
p. 306.6
She seemed to be laboring, within herself, up some steep, unprecedented slope.†
p. 348.7
They became an odd and unprecedented beauty and the beast up there; and, for the first time consciously, Cass wondered about their real relationship to one another.†
p. 358.8
But it was yet more strange and made for an unprecedented steadiness and freedom, that Eric loved him.†
p. 387.6 *

Definitions:

(1) (unprecedented)
not having happened before; or nothing similar having happened before
(2) (meaning too rare to warrant focus)