In a manner relating to farming, rural life, or agricultural principles.
Agrarian + -ly (adverbial suffix meaning 'in the manner of'). The -ly suffix comes from Old English 'líc' meaning 'like or body,' eventually becoming the standard way to form adverbs in English.
English is wonderfully flexible—while 'agrarianly' is rare, it perfectly demonstrates how we can modify almost any adjective with -ly to create adverbs. Medieval monks wrote 'agrarianly' when describing farming techniques in Latin-influenced English texts.
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