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I want to make list od description by using \begin{description} and align the long label on the same starting point.

\begin{description}[leftmargin= 1.27cm, labelwidth=6cm]
    \item[h_{\mathrm{obs}_i}] : the cleaned and corrected ISSH measurements of i\textsuperscript{th} along-track point..
    \item[i] : the index for every satellite pass's co-located observation point time series.
    \item[h_{0i}] : the averaged sea surface heights of i\textsuperscript{th} along-track point.
    \item[h_{1i} t_j] : the trend part (linear sea level change).
    \item[h_{2i}cos(\omega_1 \cdot t_j)+h_{3i}sin(\omega_1 \cdot t_j)] : annual ocean variability signals.
    \item[h_{4i}cos(\omega_2 \cdot t_j)+h_{5i}sin(\omega_2 \cdot t_j)] : semiannual ocean variability signals.
    \item[\omega_1 \; \text{and}\;\omega_2] : the angular frequencies for annual and semiannual variations $\omega_1 = 2\pi/12$ and $\omega_2=2\pi/6$ respectively.
    \item[t_j] : the time difference between observation and reference epoch time $t_j=t_i-t_0$.
    \item[s] : the number of the selected satellite missions,
    \item[b_k] : the bias term, $k = (1, 2, 3, \cdots, s)$. 
    \end{description}

My code produces the following result:

enter image description here

However, I want the following result:

enter image description here

Jisika
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    Please extend your example to a full but minimal example. Then it is a lot easier for others to test and suggest solutions. Have you looked in the enumiem manual? (you might want to tag the question with enumitem as it is clearly related. – daleif Mar 24 '23 at 08:22
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    You could also use a tabular environment for this. – dexteritas Mar 24 '23 at 08:30
  • I'd not use the colons. – egreg Mar 24 '23 at 13:14

1 Answers1

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As @daleif said, please provide a full MWE.

You can do this by setting leftmargin properly. This is what I do in the following lines:

\documentclass{article}
\usepackage{enumitem,mathtools}

\newlength\mylabelwidth
\setlength\mylabelwidth{6cm}
\newlength\myleftmargin
\settowidth\myleftmargin{: }
\addtolength\myleftmargin\mylabelwidth
\addtolength\myleftmargin\labelsep


\begin{document}
    \begin{description}[leftmargin=\myleftmargin, labelwidth=\mylabelwidth]
        \item[$h_{\mathrm{obs}i}$]: the cleaned and corrected ISSH measurements of i\textsuperscript{th} along-track point..
        \item[$i$] : the index for every satellite pass's co-located observation point time series.
        \item[$h{0i}$] : the averaged sea surface heights of i\textsuperscript{th} along-track point.
        \item[$h_{1i} t_j$] : the trend part (linear sea level change).
        \item[$h_{2i}\cos(\omega_1 \cdot t_j)+h_{3i}\sin(\omega_1 \cdot t_j)$] : annual ocean variability signals.
        \item[$h_{4i}\cos(\omega_2 \cdot t_j)+h_{5i}\sin(\omega_2 \cdot t_j)$] : semiannual ocean variability signals.
        \item[$\omega_1 ; \text{and};\omega_2$] : the angular frequencies for annual and semiannual variations $\omega_1 = 2\pi/12$ and $\omega_2=2\pi/6$ respectively.
        \item[$t_j$] : the time difference between observation and reference epoch time $t_j=t_i-t_0$.
        \item[$s$] : the number of the selected satellite missions,
        \item[$b_k$] : the bias term, $k = (1, 2, 3, \cdots, s)$. 
    \end{description}
\end{document}

I want to add that I do not like the colons in your description a lot. As your description is typeset in justification, spaces can be enlarged, such that you will not have each line perfectly aligned, see second to last row: "the" is more to the right than "missions".

Result

Therefore I recommend to drop the colons and change my length specification to

\newlength\mylabelwidth
\setlength\mylabelwidth{6cm}
\newlength\myleftmargin
\setlength\myleftmargin{\dimexpr\mylabelwidth+\labelsep\relax}
Οὖτις
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