Dependent = (adjective) depending on/upon someone or something.

• He is dependent on his parents as he is out of job.
• success in your career is dependent upon your hard work and determination.
• The majority of Indian farmers are dependent on traditional methods of cultivation.

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Dependant=(noun) someone who depends upon another or others for a home, food etc.

• Bank employees can claim reimbursement on the medical expenses of their dependants also.
• All his children are minor and therefore they are fully his dependants.
• Married women receive only the basic pension as their husbands’ dependants.