'conventionally-produced' originates from 'convention' and 'produce', where 'convention' meant 'a way in which something is usually done' and 'produce' meant 'to create or bring into existence'.

'convention' changed from the Latin word 'conventio' and 'produce' from the Latin word 'producere', eventually becoming the modern English words 'convention' and 'produce'.

Initially, 'convention' meant 'a coming together' and 'produce' meant 'to lead forth', but over time they evolved into their current meanings of 'standard practice' and 'to create'.