\begin{definition}[Definition:Avoirdupois/Stone]
The '''stone''' is an avoirdupois unit of mass.
{{begin-eqn}}
{{eqn | o = 
      | r = 1
      | c = '''stone'''
}}
{{eqn | r = 14
      | c = pounds avoirdupois
}}
{{eqn | r = 224
      | c = ounces avoirdupois
}}
{{eqn | o = \approx
      | r = 6 \, 350 \cdotp 29318
      | c = grams
}}
{{end-eqn}}
The gram equivalent is exact.
\end{definition}