Longman Dictionary of Contemporary English homepage

specification

noun
     
spe‧ci‧fi‧ca‧tion [countable]
1 [usually plural] a detailed instruction about how a car, building, piece of equipment etc should be made
build/manufacture/produce something to ... specifications
The airport building had been constructed to FAA specifications.
The bolts met all the engineering specifications.
2 especially British English a clear statement of what is needed or wanted:
a specification of what role each member will play
job specification (=a detailed description of what a job involves)

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