specification
US /ˌspes.ə.fəˈkeɪ.ʃən/
UK /ˌspes.ə.fəˈkeɪ.ʃən/

1.
a detailed description of the design and materials used to make something
:
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The architect provided detailed specifications for the new building.
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Please check the product specifications before making a purchase.
2.
the act of identifying something precisely or of stating a precise requirement
:
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The specification of the problem was crucial for finding a solution.
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The project manager emphasized the need for clear specification of roles.