\begin{definition}[Definition:Avoirdupois/Pound]
The '''pound''' is an avoirdupois unit of mass.
{{begin-eqn}}
{{eqn | o = 
      | r = 1
      | c = '''pound avoirdupois'''
}}
{{eqn | r = 16
      | c = ounces avoirdupois
}}
{{eqn | r = 7 \, 000
      | c = grains
}}
{{eqn | r = 453 \cdotp 59237
      | c = grams
}}
{{end-eqn}}
The gram equivalent is defined to be exact.
\end{definition}