\begin{definition}[Definition:Imperial/Length/Yard]
The '''yard''' is an imperial unit of length.
{{begin-eqn}}
{{eqn | o = 
      | r = 1
      | c = '''yard'''
}}
{{eqn | r = 3
      | c = feet
}}
{{eqn | r = 36
      | c = inches
}}
{{eqn | r = 91 \cdot 44
      | c = centimetres
}}
{{eqn | r = 0 \cdotp 9144
      | c = metres
}}
{{end-eqn}}
\end{definition}