Source : Webster's Revised Unabridged Dictionary (1913)

Dependant \De*pend"ant\, Dependance \De*pend"ance\, n.,
Dependancy \De*pend"an*cy\, n.
   See {Dependent}, {Dependence}, {Dependency}.

   Note: The forms dependant, dependance, dependancy are from
         the French; the forms dependent, etc., are from the
         Latin. Some authorities give preference to the form
         dependant when the word is a noun, thus distinguishing
         it from the adjective, usually written dependent.

Source : WordNet®

dependant
     adj 1: contingent on something else [syn: {dependent}, {qualified}]
     2: addicted to a drug [syn: {dependent}, {drug-addicted}, {hooked},
         {strung-out}]
     n : a person who relies on another person for support
         (especially financial support) [syn: {dependent}]