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Explanation: Webster's 1913 Dictionary
1. Not dispensable; impossible to be omitted, remitted, or spared; absolutely necessary or requisite.
2. (Eccl.) Not admitting dispensation; not subject to release or exemption.
The law was moral and indispensable.
- Bp. Burnet.
3. Unavoidable; inevitable.
Adj. 1. indispensable - not to be dispensed with; essential; "foods indispensable to good nutrition"
dispensable - capable of being dispensed with or done without; "dispensable items of personal property"
2. indispensable - absolutely necessary; vitally necessary; "essential tools and materials"; "funds essential to the completion of the project"; "an indispensable worker"
3. indispensable - unavoidable; "the routine but indispensable ceremonies of state"
Ad ogni modo penso che riformulerei in modo simile al seguente:
"it is necessary to comply with the requirements set forth in the specification"
"the specification requirements are necessarily to be complied with"