Pronunciation: /ɛksəˈleɪʃ(ə)n/
noun
[mass noun]-
the process or action of exhaling: the gas produced at the end of exhalation from deep within the lung
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[count noun] an expiration of air from the lungs: he let his breath out in a long exhalation of relief
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[count noun] an amount of vapour or fumes given off by something: moist exhalations from the sea [mass noun]: the nocturnal exhalation of vapours from decaying vegetable matter