The quality or state of being away or absent from a place or person.
From 'away' (from Old English 'aweg' meaning 'off, gone') + '-ness' (suffix forming abstract nouns). The '-ness' suffix allows the adverb 'away' to become a noun describing the abstract concept of absence or distance.
Psychologists studying long-distance relationships now recognize 'awayness' as a measurable emotional state with specific cognitive patterns—the word captures something neuroscience is only beginning to map.
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