spe ‧ ci ‧ fi ‧ ca ‧ tion AC /ˌspesəfəˈkeɪʃ ə n, ˌspesɪfəˈkeɪʃ ə n/ BrE AmE noun [countable]
[ Word Family: verb : ↑ specify ; noun : ↑ specification ]
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)