A dependant (US spelling: dependent) is a person who relies on another as a primary source of income.
A common-law spouse who is financially supported by their partner may also be included in this definition.
[1] In some jurisdictions, supporting a dependant may enable the provider to claim a tax deduction.
In the United Kingdom, a full-time student in higher education who financially supports another adult may qualify for an Adult Dependant's Grant.
[2] In the US, a taxpayer may claim exemptions for their dependants.