Short for atmosphere; informal or abbreviation for atmospheric conditions or atmospheric pressure.
Shortened form of 'atmosphere,' which comes from Greek atmo- (vapor) + sphaira (sphere). Used colloquially in meteorology and aviation.
In aviation, pilots say 'check the atmo conditions' as shorthand, the same way photographers talk about 'atmo effects'—it's a perfectly modern contraction showing how 'atmosphere' had that vapor root all along.
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