\begin{definition}[Definition:Calendar/Muslim/Year]
A '''Muslim year''', also known as the '''Islamic year''' or '''Hijra year''', is the length of a year as defined using the '''Muslim calendar'''.
:$1$ '''Muslim year''' $= \begin{cases} 355 \, \text {days} & : \text {Leap year} \\
354 \, \text {days} & : \text {Non-leap year} \end{cases}$
\end{definition}