a. and sb. [f. THOUSAND + -TH. Not found before 16th c.: cf. THOUSAND 4.] The ordinal numeral belonging to the cardinal THOUSAND.

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  A.  adj. 1. Coming last in order of a thousand successive individuals.

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1552.  Huloet, Thousandth, millesimus.

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1656.  trans. Hobbes’ Elem. Philos. (1839), 100. Though our computation reach the fixed stars, or the ninth or tenth, nay, the thousandth sphere.

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1732.  Pope, Ess. Man, I. 246. From Nature’s chain whatever link you strike, Tenth or ten thousandth, breaks the chain alike.

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1875.  Bryce, Holy Rom. Emp. (ed. 5), vi. 77. Modern Germany proclaims the era of A. D. 843 the beginning of her national existence, and celebrated its thousandth anniversary thirty-two years ago.

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  2.  Thousandth part: one of a thousand equal parts into which anything may be divided.

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1561.  T. Hoby, trans. Castiglione’s Courtyer, I. K ij. Ye felt not the thousandeth part of ye delite.

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1710.  Berkeley, Princ. Hum. Knowl., § 127. The ten thousandth part of that line.

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1782.  Herschel, in Phil. Trans., LXXII. 165. Pinions … so evenly divided as … to be depended upon … to perhaps the two, three, or four thousandth part of an inch.

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1836.  J. H. Newman, Lyra Apost. (1849), 231. Lord! Who Thy thousand years dost wait To work the thousandth part Of Thy vast plan.

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  B.  sb. A thousandth part.

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1793.  Young, in Phil. Trans., LXXXIII. 174. In the ox’s eye, the diameter of the crystalline is 700 thousandths of an inch.

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1867.  Denison, Astron. without Math., 6. Inches about a thousandth longer than our inches.

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