Grade

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Grade

(1) A designated ground level. (2) To change the contours of land.

References in classic literature ?
It would be easy to show that within the same group carnivorous animals exist having every intermediate grade between truly aquatic and strictly terrestrial habits; and as each exists by a struggle for life, it is clear that each is well adapted in its habits to its place in nature.
Although no graduated links of structure, fitted for gliding through the air, now connect the Galeopithecus with the other Lemuridae, yet I can see no difficulty in supposing that such links formerly existed, and that each had been formed by the same steps as in the case of the less perfectly gliding squirrels; and that each grade of structure had been useful to its possessor.
Yet reason tells me, that if numerous gradations from a perfect and complex eye to one very imperfect and simple, each grade being useful to its possessor, can be shown to exist; if further, the eye does vary ever so slightly, and the variations be inherited, which is certainly the case; and if any variation or modification in the organ be ever useful to an animal under changing conditions of life, then the difficulty of believing that a perfect and complex eye could be formed by natural selection, though insuperable by our imagination, can hardly be considered real.
The company was not, in our sense of the term, select, for it comprehended persons of very many grades and classes; nor was there any great display of costly attire: indeed, some of the costumes may have been, for aught I know, grotesque enough.
excuse me for my impertinence (I am really ashamed to be worrying you like this), you see, you've removed my anxiety as to the two grades getting mixed, but .
Around a sharp turn, speeding down the grade upon them, had appeared an automobile.
These animals ain't automobile broke altogether, an' if you think I'm goin' to have 'em shy off the grade you got another guess comin'.
But so surely as the dead of night set in, so surely this man was in the midst of the loose concourse in the night-cellar where outcasts of every grade resorted; and there he sat till morning.
Countrymen, butchers, drovers, hawkers, boys, thieves, idlers, and vagabonds of every low grade, were mingled together in a mass; the whistling of drovers, the barking dogs, the bellowing and plunging of the oxen, the bleating of sheep, the grunting and squeaking of pigs, the cries of hawkers, the shouts, oaths, and quarrelling on all sides; the ringing of bells and roar of voices, that issued from every public-house; the crowding, pushing, driving, beating, whooping and yelling; the hideous and discordant dim that resounded from every corner of the market; and the unwashed, unshaven, squalid, and dirty figues constantly running to and fro, and bursting in and out of the throng; rendered it a stunning and bewildering scene, which quite confounded the senses.
Ogg's, who might consider themselves a grade above him in society because their fathers were professional men, or had large oil-mills.
ST-4620 carbon black is an excellent fit for this situation because of its higher resistance compared to conventional grades.
Allowables do not state applicable grades, causing confusion among engineers.