Water or other liquid present in small quantities, especially as vapor in the air or absorbed in materials.
From Old French 'moistour', from 'moiste' (moist), possibly from Vulgar Latin 'muscidus' (moldy, musty). The word emphasizes the subtle presence of water rather than obvious wetness.
Moisture occupies a fascinating middle ground between dry and wet - it's water that's present but not overwhelming. Plants and humans are exquisitely sensitive to moisture levels, making it crucial for life despite being nearly invisible.
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