\begin{definition}[Definition:Imperial/Length/Mil]
The '''mil''' is an imperial unit of length.
{{begin-eqn}}
{{eqn | o = 
      | r = 1
      | c = '''mil'''
}}
{{eqn | r = \dfrac 1 {1000}
      | c = inch
}}
{{eqn | r = 25 \cdotp 4
      | c = microns
}}
{{eqn | r = 0 \cdotp 0254
      | c = millimetres
}}
{{eqn | r = 2 \cdotp 54 \times 10^{-5}
      | c = metres
}}
{{end-eqn}}
\end{definition}