Your glossary page can take advantage of definitions stored in a data file. This gives you the ability to reuse the same definition in multiple places. Additionally, you can use Bootstrap classes to arrange your definition list horizontally.
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You can create a glossary for your content. First create your glossary items in a data file such as glossary.yml.

Then create a page and use definition list formatting, like this:

fractious
Like a little mischevious child, full of annoying and constant trouble.
gratuitous
Something that is unwarranted and uncouth, like the social equivalent of a flagrant foul.
haughty
Proud and flaunting it. Holding your head high up like a snooty, too-good-for-everything rich person.
gratuitous
Something that is unwarranted and uncouth, like the social equivalent of a flagrant foul.
impertinent
Brave and courageous especially in a difficult, dangerous situation.

Here’s the code:

fractious
: {{site.data.glossary.fractious}}

gratuitous
: {{site.data.glossary.gratuitous}}

haughty
: {{site.data.glossary.haughty}}

gratuitous
: {{site.data.glossary.gratuitous}}

impertinent
: {{site.data.glossary.intrepid}}

The glossary works well as a link in the top navigation bar.

Horizontally styled definiton lists

You can also change the definition list (dl) class to dl-horizontal. This is a Bootstrap specific class. If you do, the styling looks like this:

fractious
Like a little mischevious child, full of annoying and constant trouble.
gratuitous
Something that is unwarranted and uncouth, like the social equivalent of a flagrant foul.
haughty
Proud and flaunting it. Holding your head high up like a snooty, too-good-for-everything rich person.
gratuitous
Something that is unwarranted and uncouth, like the social equivalent of a flagrant foul.
impertinent
Someone acting rude and insensitive to others.
intrepid
Brave and courageous especially in a difficult, dangerous situation.

For this type of list, you must use HTML. The list would then look like this:

<dl class="dl-horizontal">

<dt id="fractious">fractious</dt>
<dd>{{site.data.glossary.fractious}}</dd>

<dt id="gratuitous">gratuitous</dt>
<dd>{{site.data.glossary.gratuitous}}</dd>

<dt id="haughty">haughty</dt>
<dd>{{site.data.glossary.haughty}}</dd>

<dt id="benchmark_id">gratuitous</dt>
<dd>{{site.data.glossary.gratuitous}}</dd>

<dt id="impertinent">impertinent</dt>
<dd>{{site.data.glossary.impertinent}}</dd>

<dt id="intrepid">intrepid</dt>
<dd>{{site.data.glossary.intrepid}}</dd>

</dl>

If you squish your screen small enough, at a certain breakpoint this style reverts to the regular dl class.

Although I like the side-by-side view for shorter definitions, I found it problematic with longer definitions.