migration noun
ADJ. seasonal the seasonal migration of birds | internal, inward | international | mass
QUANT. wave the great waves of migration that took Europeans to the New World
MIGRATION + VERB occur | increase
MIGRATION + NOUN path, pattern, route changes in the migration routes of reindeer
PREP. ~ from, ~ to migration from rural to urban areas
You can also check other dicts: migration (English, 中文解释 ), wordnet sense, Collins Definition