I know the title is a bit weird but I'll try to explain it in a better way here. In the beginning of a chapter I'd like to define some basic terms. Currently I'm using


which results in the following:enter image description here

Is there an easy way to do it without "Definition 1." but "Machine Learning" ?


mdframed lacks the possibility to define unnumbered theorems, but it's not difficult to add it.

Next, a common trick for a variable label can be applied.


\NewDocumentCommand\newmdtheoremenvnonumber{O{} m m }{%




\begin{mydef}{Machine Learning}
Machine learning is the field of study that gives computers
the ability to learn without being explicitly programmed.
\attribution{Arthur Samuel, 1959}.


enter image description here

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