'Orthodox' originates from Greek, specifically the word 'orthodoxos,' where 'orthos' meant 'correct' or 'straight' and 'doxa' meant 'opinion' or 'belief.'

'Orthodoxos' was adopted into Late Latin as 'orthodoxus,' then into Middle French as 'orthodoxe,' and eventually became the modern English word 'orthodox.'

Initially, it meant 'having the right opinion or belief,' but over time it evolved into its current meaning of 'conforming to established or traditional beliefs, especially in religion or philosophy.'