half a chance

:  either of two equal parts that compose something

:  a part approximately equal to one of these

:  one of a pair: such as

:  being one of two equal parts

:  that is approximately equal to either of two equal parts that compose something :  amounting to approximately half

:  falling short of the full or complete thing :  partial

:  in an equal part or degree

:  not completely :  partially

:  by any means :  at all

:  something that happens unpredictably without discernible human intention or observable cause

:  the assumed impersonal purposeless determiner of unaccountable happenings :  luck

:  the fortuitous or incalculable element in existence :  contingency

:  to take place, come about, or turn out by chance :  happen

:  to have the good or bad luck

:  to come or light by chance