The process of becoming accustomed or habituated to something through repeated exposure or practice.
From Latin 'assuefacere' (to accustom), combining 'ad-' (to) and 'suescere' (to become accustomed). The suffix '-faction' comes from 'facere' (to make), so the word literally means 'making accustomed.' It evolved in English to describe the gradual process of habit formation.
This word captures something psychology has only recently formalized: how our brains literally rewire through repetition. Interestingly, it's almost obsolete in modern English, replaced by 'habituation,' yet it survived longest in medical and philosophical texts as a term for how the body adapts to drugs or stimuli—exactly what we now study in neuroscience!
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