a. and sb. [UN-1 7, 5 b, 12.]

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  1.  Of things: Not having an official character or stamp.

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1798.  Monthly Rev., XXVI. 51. Impertinent and unofficial as it seems, it may have been intended to intimate [etc.].

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1866.  Geo. Eliot, F. Holt, Introd. 3. His sheep-dog following with a heedless unofficial air as of a beadle in undress.

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1884.  Huxley, in Life (1900), II. 80. I wrote to Evans an unofficial letter.

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  2.  Of persons: Not holding an official position; not acting in an official capacity.

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1829.  Gen. P. Thompson, Exerc. (1842), I. 124. Unofficial philosophers must be content to classify appearances as they rise.

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1869.  J. Martineau, Ess., II. 97. The theories of these unofficial masters of philosophy.

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  b.  sb. One who is not an official.

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1887.  Pall Mall G., 29 July, 4/1. We have a letter this morning from St. Petersburg, the writer of which is a leader among the ‘unofficials.’

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