maintain

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maintain

i. The term as used in air traffic control terminology and as it pertains to altitude/flight level means, “Remain at the altitude/flight level, as specified.” The phrase “climb and” or “descend and” normally precedes “maintain” and the altitude assignment (e.g., “Descend and maintain 6000”).
ii. Concerning other ATC (air traffic control) instructions, the term is used in a literal sense: “Maintain VFR (visual flight rules).”
iii. A verb of maintenance.
References in classic literature ?
We know that mind has the power to maintain substance even though it may not be able to create substance--the latter is still an open question.
But tell me, how does Tario live, and the other etherealists who maintain that food is unnecessary?
He says that inasmuch as we maintain that we alone are real we should, to be consistent, admit that we alone are proper food for Komal.
The great capital of this association; their long established system; their hereditary influence over the Indian tribes; their internal organization, which makes every thing go on with the regularity of a machine; and the low wages of their people, who are mostly Canadians, give them great advantages over the American traders: nor is it likely the latter will ever be able to maintain any footing in the land, until the question of territorial right is adjusted between the two countries.
Those who maintain that mind is the reality and matter an evil dream are called "idealists"--a word which has a different meaning in philosophy from that which it bears in ordinary life.
Realists, on the other hand, as a rule, suppress the content, and maintain that a thought consists either of act and object alone, or of object alone.
Accordingly they maintain that in knowledge we are in direct contact with objects, which may be, and usually are, outside our own minds.
All candid and intelligent men must, upon due consideration, acknowledge that the principle of the objection is equally applicable to either of the two cases; and that whether we have one government for all the States, or different governments for different parcels of them, or even if there should be an entire separation of the States, there might sometimes be a necessity to make use of a force constituted differently from the militia, to preserve the peace of the community and to maintain the just authority of the laws against those violent invasions of them which amount to insurrections and rebellions.
For a long time to come, it will not be possible to maintain a large army; and as the means of doing this increase, the population and natural strength of the community will proportionably increase.
At the school where the reviving prosperity of his father was enabled to maintain him, young Marmaduke formed an intimacy with a youth whose years were about equal to his own.
Values did man only assign to things in order to maintain himself--he created only the significance of things, a human significance
So we were saying the problem may be put thus: to maintain nutrition and to give tone to the nerves.