The quality or state of being absentminded; a tendency to forget things or not pay attention because you're thinking about something else.
From absentminded (adjective) + -ness (suffix forming nouns from adjectives, denoting quality or state). The concept emerged as absentmindedness became recognized as a distinct character trait in the 18th century.
Psychologists distinguish between absentmindedness (forgetting due to inattention) and absent-mindedness caused by ADHD or aging—one is about focus lapses, the other about attention regulation or memory decline, and they respond to very different interventions.
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