The state or quality of being deeply absorbed or completely focused on something.
From absorbed plus -ness (forming nouns from adjectives). This creates a noun describing the condition or quality of deep concentration and attention.
Mihaly Csikszentmihalyi's famous concept of 'flow' is basically a scientific name for absorbedness—that magical state where time disappears and you're completely one with what you're doing, whether it's sports, music, or coding.
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