permissible

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permissible

[pər′mis·ə·bəl]
(mining engineering)
Said of equipment completely assembled and conforming in every respect with the design formally approved by the U.S. Bureau of Mines for use in gassy and dusty mines.
References in classic literature ?
Besides, what can be more permissible than to write to an old friend of twelve years' standing, particularly when the letter begins with the words `Monsieur Raoul'?
32: "The sole permissible formula is this: Intelligence progresses from the indefinite to the definite.
Joy came first, in spite of the threatening train behind it--joy in the impression that it was really herself whom Will loved and was renouncing, that there was really no other love less permissible, more blameworthy, which honor was hurrying him away from.