All 3 Uses

migrant
in
The Pregnancy Project
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Within my school district, nearly 98 percent of students qualify for free or reduced-price lunches, a third of the students are still learning English, and a large percentage are from migrant families.†
p. 39.4

migrant = one who moves from one place to another
Just about all of my friends have parents who work migrant jobs, and that means that none of us are living much over the poverty line.†
p. 39.8 *
And third, they accepted me into their College Assistance Migrant Program (CAMP), which provides not only financial aid but also services like counseling and tutoring for first-year college students.†
p. 211.6

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)