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Thereβs a detailed answer here: How does UK Visa application define a dependent?
Typically, a dependent is someone who relies on you for financial support. So a spouse who is a homemaker (doesnβt have a job outside the home or other independent means). A child who is employed can also be classed as financially dependent eg if they live with their parent(s) but donβt contribute anything to the household budget, or just pay for food but not accommodation