WAEC - Government (2012 - No. 29)
The coming together of two or more political parties to form a government is
coalition
merger
unification
co-operation
Paliwanag
A political coalition or political alliance or political bloc is an agreement for cooperation between different political parties on common political agenda often for purposes of contesting an election to mutually benefit by collectively clearing election thresholds or otherwise benefiting from characteristics of the voting system or for government formation after elections.