'erratic' originates from Latin, specifically the word 'erraticus,' where 'errare' meant 'to wander.' 'Dismiss' originates from Latin, specifically the word 'dimittere,' where 'dis-' meant 'apart' and 'mittere' meant 'send.'

'erraticus' transformed into the Old French word 'erratique,' and eventually became the modern English word 'erratic.' 'Dimittere' transformed into the Old French word 'desmis,' and eventually became the modern English word 'dismiss.'

Initially, 'erratic' meant 'wandering' and 'dismiss' meant 'send away,' but over time they evolved into their current meanings of 'unpredictable' and 'remove from position,' respectively.