Attainture

[…] thus, I fear, at last Hume’s knavery will be the duchess’ wreck, And her attainture will be Humphrey’s fall:

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1637, Philemon Holland (translator), Britain, or A Chorographicall Description […] by William Camden, London: George Latham, “The O-Neales, and their rebellions in our time,” p. 122, The title and place of Earle of Tir-Oen was presently granted: but as touching the inheritance, considering that upon the forfaiture and attainture of Shan O-Neale the Kings of England were invested therein, the matter was referred unto Queene Elizabeth:

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[…] you may come, And take more strickt directions from his highnesse, Then he thinkes fit his letters should containe, Without the least attainture of your valure;

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[…] they must dig up the good name of these prime worthies […] and brand them as the Papists did thir bodies; and those thir pure unblamable spirits, which live not only in heaven, but in thir writings, they must attaint with new attaintures which no Protestant ever before aspers’t them with.

Source: wiktionary