All 3 Uses

migrant
in
Farewell to Manzanar
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The house we lived in was nothing more than a shack, a barracks with single plank walls and rough wooden floors, like the cheapest kind of migrant workers' housing.†
Chpt 1.2 *

migrant = one who moves from one place to another
Thirty years after sailing away from a financial dead end and the remnants of a once-noble family in Japan, he found himself in the middle of America's Depression and on the move again, with eight kids and a wife this time, working his way down the California coast picking prunes, peaches, Brussels sprouts, sending his children into the orchards like any migrant worker's family, hoping their combined earnings would leave a little left over after everyone was fed and the cars gassed up for the next day's search for work.†
Chpt 1.6
After three years at our junior high school, in a ghetto neighborhood that included many Asians, Blacks, Mexicans, and other white migrants from the south, we had ended up close to being social equals.†
Chpt 2.21

migrants = those who moves from one place to another

Definitions:

(1) (migrant)
a person (or animal) that moves from one place to another -- sometimes seasonally -- sometimes for work
(2) (meaning too rare to warrant focus)