Something like this is it sufficient and is corresponds to your request?
\documentclass[a4paper,12pt]{article}
\usepackage{amsmath,amssymb}
\usepackage{newtxtext} % optional package for text font in Times New Roman
\begin{document}
Where,
\begin{equation*}
\begin{split}
u_{i} &= \text{Horizontal displacement}\\
v_{i} & = \text{Vertical displacement}\\
\varphi_{i} & = \text{Rotation Angle}
\end{split}
\end{equation*}
\end{document}

\documentclass[a4paper,12pt]{article}
\usepackage{amsmath,amssymb}
\usepackage{newtxtext} % optional package for text font in Times New Roman
\usepackage{newtxmath} % optional package for math-font Times New Roman
\begin{document}
Where,
\begin{equation*}
\begin{split}
u_{i} &= \text{Horizontal displacement}\\
v_{i} & = \text{Vertical displacement}\\
\varphi_{i} & = \text{Rotation Angle}
\end{split}
\end{equation*}
\end{document}
