In a way that is usual, traditional, or commonly done; according to established practice or habit.
From 'customary' (following custom) plus the adverbial suffix '-ly.' The root 'custom' comes from Latin 'consuetudo,' and the '-ary' suffix means 'relating to or characterized by,' creating an adjective from a noun.
The phrase 'customarily done' appears constantly in anthropology books because cultures identify themselves through what they 'customarily' do—your language, food, greetings, and rituals are customary markers that say 'this is who we are as a group.'
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