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a. The action or process of inhaling and exhaling; breathing. Also called ventilation.
b. An act of inhaling and exhaling; a breath.
2. The action or process by which an organism without lungs, such as a fish or plant, exchanges gases with its environment.
a. The oxidative process occurring within living cells by which the chemical energy of organic molecules is converted in a series of metabolic steps into usable energy in the form of ATP, involving the consumption of oxygen and the production of carbon dioxide and water as byproducts.
b. Any of various analogous metabolic processes by which certain organisms, such as anaerobic bacteria and some fungi, obtain energy from organic molecules without consuming oxygen.

res′pi·ra′tion·al adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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Personally, I am more toward translating it as "air" or "respirational energies" as Hui Wu did (2016, p.
The respirational process is itself determined by a circulation of air entering and leaving the body, including gas exchanges, transmissions and transformations of chemical substances.
As far as these latter are concerned, I do not solely mean that the syllabic values, acoustic configurations, patterns of segmentation, syntactic shapes of a line in the ST (i.e., those elements that constitute it as a line) cannot be transferred to a line of similar length and ingredients in the target text; I also mean that while the line in regular verse can be confidently identified as a given metrico-rhythmic unit, as a participant in a given intonational and respirational field (the stanza), the free-verse line may be structurally opaque, the mere aggregate of its effects, which we may justify retrospectively, on expressive grounds, but in which we may discern no constructional principle.