Make multiple-page table with two columns, start from left column to the right column

Question

i need to make a list of symbols based on a multiple-page table or another way as long as produce the same. And yes, i've read : List of Tables?. But it's too complicated for a beginner like me. I just need to input the cell column by myself one by one and not automatic. Here is my requirements:

1. My table might break the page since i have a lot of symbols. I need something like longtable but supports two columns.
2. Two columns here means the table fills the left column first, then fills the right column, break the page, start from left column, to the right column, etc.
3. Each left and right column has the same width size.
4. Repeated head of the table.

This is not really an attempt, but here's my MWE using longtable, if the cells are not long enough to demonstrate page breaking, please repeat some rows:

\documentclass[a4paper,12pt,oneside,openany]{book}
\usepackage{longtable}
\usepackage[a4paper, inner=4cm, outer=3cm, top=4cm, bottom=3cm]{geometry}
\begin{document}
\chapter*{\textbf{LIST OF SYMBOLS}}

\begin{longtable}{p{1cm}p{.5cm}p{3cm}}
    \multicolumn{1}{c}{\centering \textbf{Symbol}}
    & \multicolumn{1}{c}{\centering \textbf{}}
    & \multicolumn{1}{c}{\centering \textbf{Meaning}}\\
    \endfirsthead
    \multicolumn{1}{c}{\centering \textbf{Symbol}}
    & \multicolumn{1}{c}{\centering \textbf{}}
    & \multicolumn{1}{c}{\centering \textbf{Meaning}}\\
    \endhead 
    $a$ &=& This is letter $a$\\
    $b$ &=& This is letter $b$\\
    $c$ &=& This is letter $c$\\
    $d$ &=& This is letter $d$\\
    $e$ &=& This is letter $e$\\
    $f$ &=& This is letter $f$\\
    $g$ &=& This is letter $g$\\
    $h$ &=& This is letter $h$\\
    $i$ &=& This is letter $i$\\
    $j$ &=& This is letter $j$\\
    $k$ &=& This is letter $k$\\
    $l$ &=& This is letter $l$\\
    $m$ &=& This is letter $m$\\
    $n$ &=& This is letter $n$\\
    $o$ &=& This is letter $o$\\
    $p$ &=& This is letter $p$\\
    $q$ &=& This is letter $q$\\
    $r$ &=& This is letter $r$\\
    $s$ &=& This is letter $s$\\
    $t$ &=& This is letter $t$\\
    $u$ &=& This is letter $u$\\
    $v$ &=& This is letter $v$\\
    $w$ &=& This is letter $w$\\
    $x$ &=& This is letter $x$\\
    $y$ &=& This is letter $y$\\
    $z$ &=& This is letter $z$\\
    $a$ &=& This is letter $a$\\
    $b$ &=& This is letter $b$\\
    $c$ &=& This is letter $c$\\
    $d$ &=& This is letter $d$\\
    $e$ &=& This is letter $e$\\
    $f$ &=& This is letter $f$\\
    $g$ &=& This is letter $g$\\
    $h$ &=& This is letter $h$\\
    $i$ &=& This is letter $i$\\
    $j$ &=& This is letter $j$\\
    $k$ &=& This is letter $k$\\
    $l$ &=& This is letter $l$\\
    $m$ &=& This is letter $m$\\
    $n$ &=& This is letter $n$\\
    $o$ &=& This is letter $o$\\
    $p$ &=& This is letter $p$\\
    $q$ &=& This is letter $q$\\
    $r$ &=& This is letter $r$\\
    $s$ &=& This is letter $s$\\
    $t$ &=& This is letter $t$\\
    $u$ &=& This is letter $u$\\
    $v$ &=& This is letter $v$\\
    $w$ &=& This is letter $w$\\
    $x$ &=& This is letter $x$\\
    $y$ &=& This is letter $y$\\
    $z$ &=& This is letter $z$
\end{longtable}
\end{document}

Hope you can help me. Thanks in advance!

Answer 1

With the help of supertabular you can achieve a page-breaking table that also works inside of a twocolumn page:

\documentclass[a4paper,12pt,oneside,openany]{book}
\usepackage{supertabular}
\usepackage[a4paper, inner=4cm, outer=3cm, top=4cm, bottom=3cm]{geometry}
\usepackage{lipsum} % just for dummy text. Do not use in actual document.
\begin{document}
\lipsum

\twocolumn
\chapter*{LIST OF SYMBOLS}
\tablehead{
    \multicolumn{1}{c}{\textbf{Symbol}}
    & \multicolumn{1}{c}{\textbf{}}
    & \multicolumn{1}{c}{\textbf{Meaning}}\\
} 
\begin{supertabular}{p{1cm}p{.5cm}p{3cm}}
    $a$ &=& This is letter $a$\\
    $b$ &=& This is letter $b$\\
    $c$ &=& This is letter $c$\\
    $d$ &=& This is letter $d$\\
    $e$ &=& This is letter $e$\\
    $f$ &=& This is letter $f$\\
    $g$ &=& This is letter $g$\\
    $h$ &=& This is letter $h$\\
    $i$ &=& This is letter $i$\\
    $j$ &=& This is letter $j$\\
    $k$ &=& This is letter $k$\\
    $l$ &=& This is letter $l$\\
    $m$ &=& This is letter $m$\\
    $n$ &=& This is letter $n$\\
    $o$ &=& This is letter $o$\\
    $p$ &=& This is letter $p$\\
    $q$ &=& This is letter $q$\\
    $r$ &=& This is letter $r$\\
    $s$ &=& This is letter $s$\\
    $t$ &=& This is letter $t$\\
    $u$ &=& This is letter $u$\\
    $v$ &=& This is letter $v$\\
    $w$ &=& This is letter $w$\\
    $x$ &=& This is letter $x$\\
    $y$ &=& This is letter $y$\\
    $z$ &=& This is letter $z$\\
    $a$ &=& This is letter $a$\\
    $b$ &=& This is letter $b$\\
    $c$ &=& This is letter $c$\\
    $d$ &=& This is letter $d$\\
    $e$ &=& This is letter $e$\\
    $f$ &=& This is letter $f$\\
    $g$ &=& This is letter $g$\\
    $h$ &=& This is letter $h$\\
    $i$ &=& This is letter $i$\\
    $j$ &=& This is letter $j$\\
    $k$ &=& This is letter $k$\\
    $l$ &=& This is letter $l$\\
    $m$ &=& This is letter $m$\\
    $n$ &=& This is letter $n$\\
    $o$ &=& This is letter $o$\\
    $p$ &=& This is letter $p$\\
    $q$ &=& This is letter $q$\\
    $r$ &=& This is letter $r$\\
    $s$ &=& This is letter $s$\\
    $t$ &=& This is letter $t$\\
    $u$ &=& This is letter $u$\\
    $v$ &=& This is letter $v$\\
    $w$ &=& This is letter $w$\\
    $x$ &=& This is letter $x$\\
    $y$ &=& This is letter $y$\\
    $z$ &=& This is letter $z$\\
    $a$ &=& This is letter $a$\\
    $b$ &=& This is letter $b$\\
    $c$ &=& This is letter $c$\\
    $d$ &=& This is letter $d$\\
    $e$ &=& This is letter $e$\\
    $f$ &=& This is letter $f$\\
    $g$ &=& This is letter $g$\\
    $h$ &=& This is letter $h$\\
    $i$ &=& This is letter $i$\\
    $j$ &=& This is letter $j$\\
    $k$ &=& This is letter $k$\\
    $l$ &=& This is letter $l$\\
    $m$ &=& This is letter $m$\\
    $n$ &=& This is letter $n$\\
    $o$ &=& This is letter $o$\\
    $p$ &=& This is letter $p$\\
    $q$ &=& This is letter $q$\\
    $r$ &=& This is letter $r$\\
    $s$ &=& This is letter $s$\\
    $t$ &=& This is letter $t$\\
    $u$ &=& This is letter $u$\\
    $v$ &=& This is letter $v$\\
    $w$ &=& This is letter $w$\\
    $x$ &=& This is letter $x$\\
    $y$ &=& This is letter $y$\\
    $z$ &=& This is letter $z$\\
\end{supertabular}
\onecolumn

\lipsum
\end{document}

---

Here is a slightly different approach with a table that automatically adjusts to the width of the column. I also assumed, all contents of the first column are supposed to be in math mode, so I automatically added that. I also added the = between the first and last column, so there is no need to repeat it over and over.

\documentclass[a4paper,12pt,oneside,openany]{book}
\usepackage{supertabular}
\usepackage{array, calc}
\usepackage[a4paper, inner=4cm, outer=3cm, top=4cm, bottom=3cm]{geometry}
\usepackage{lipsum} % just for dummy text. Do not use in actual document.
\begin{document}
\lipsum

\twocolumn
\chapter*{LIST OF SYMBOLS}
\tablehead{
    \multicolumn{1}{c}{\textbf{Symbol}}
    & \multicolumn{1}{c}{\textbf{Meaning}}\\
} 
\newlength{\mycolwidth}
\setlength{\mycolwidth}{\widthof{\textbf{Symbol}}}
\begin{supertabular}{>{\(}wl{\mycolwidth}<{\)}@{\hspace{\tabcolsep}=\hspace{\tabcolsep}}p{\dimexpr\columnwidth-4\tabcolsep-\mycolwidth-1em}}
    a &  This is letter $a$ This is letter $a$ This is letter $a$ This is letter $a$ This is letter $a$ \\
    b & This is letter $b$\\
    c & This is letter $c$\\
    d & This is letter $d$\\
\end{supertabular}
\onecolumn

\lipsum
\end{document}