merger means when two companies get merge with each other
and acquisition means when one company takeover the second 
company.

Aquisition means a company aquire another company and 
aquired company will exist but merger two companies merge 
and a new compnay will form.
examples 
aquisition tata aquired jaquar and landlover
merger arcelormittal

Aquisitions means acquiring of one company to another and 
Mergers means joint venture of two companies

aquisition means 1 company overtakes the other company.
merger means to company join hands with each other

acquisation means i love you, merger means you love me

Acquisition means "i love you" Merger means "both love each 
other". and i want merger with swapna, i like her answer.

acquisition means when one company take over another
company's assets and shares.so they can have a decision
power of that company and aquired company has also existance
after take over.
and merger means when 2 company merge with each other and 
the result of the joint venture is a form of new 3rd company.

the difference between the merger and qcquisitions is. merger is when two companies combined together. and acqusition means when one company take over other company.
examples: merger NIKE and Reebok they merg together.
          aquisitions means TATA company take over the COURSE company