'migratory' originates from Latin, specifically the word 'migratorius,' where 'migrare' meant 'to move from one place to another.'

'migratorius' transformed into the French word 'migratoire,' and eventually became the modern English word 'migratory' through Middle English.

Initially, it meant 'to move from one place to another,' and this meaning has largely remained the same in modern usage.