What is the meaning of unabsorbed depreciation, unabsorbed capital expenditure on scientific research and unabsorbed capital expenditure on promoting family planning amongst the employees?

Apart from several other deductions, while computing income chargeable to tax under the head "Profits and gains of business or profession" a person is allowed to claim deduction on account for depreciation, capital expenditure incurred by him on scientific research and capital expenditure incurred by a company for promoting family planning amongst its employees.

If the income of the year in which these expenses are incurred falls short of these expenses, then the unabsorbed expenses can be carried forward to next year in the form of unabsorbed depreciation or unabsorbed capital expenditure on scientific research or unabsorbed capital expenditure on promoting family planning amongst the employees.