Dependent / Dependant
Regional usageDependent is the adjective. In British-style spelling, dependant is the noun for a person who relies on another.
Dependent
Use when
You need the adjective meaning reliant or conditional, or the general American noun spelling.
Example
“The launch date is dependent on security clearance.”
Dependant
Use when
In British-style spelling, you mean a person who relies on someone else for support.
Example
“The benefit may cover an employee's dependant.”
Quick check
is dependant on, an employee's dependent
Usage note
Check the defined spelling in the relevant policy or legislation before changing a formal term.