amortization is the written off intangible assets. e.g
,goodwill written off

it is the written off tantigle and intangible assets

1. The provision to pay a debt over a period of time.

2. The gradual repayment of borrowings in a series of 
installments.

3. A transaction or security where the principal reduces 
over the life of the agreement.

4. The writing off or reduction in value of an intangible 
asset over time (c.f.depreciation)

5. Allocation of the cost of an asset over its estimated 
useful life

a revenue expenditure which is incurred in a year if it is
spread over a period of time then it is known as amortisation

a present value of money that has been transformed into 
an eqivalent series of cash flow considering the time value 
of money

Amortisation and depreciation are the same concepts. 
However tangible assets are depreciated,whereas intangible 
assets are amortised