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 ?
For some time past she had been suspected of being au fond, in spite of appearances, an "original." In the provinces it was not permissible to be original: being original means having ideas that are not understood by others; the provinces demand equality of mind as well as equality of manners and customs.
But suppose one pass, as is permissible in philology, from the word itself to its softened synonym, then, instead of committing an ignoble assassination you make an `elimination;' you merely and simply remove from your path the individual who is in your way, and that without shock or violence, without the display of the sufferings which, in the case of becoming a punishment, make a martyr of the victim, and a butcher, in every sense of the word, of him who inflicts them.
Thus, it was permissible for the two officers to greet him with a "Hello," or a "Good morning," and even to touch a hand in a brief and friendly pat to his head.