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In either case, you get ugly and useless output:
Text before a macro
\define wikipediaLink(articleName)
[[Wikipedia: $articleName$|https://en.wikipedia.org/wiki/$articleName$]]
\endText before a macro
\define wikipediaLink(articleName) Wikipedia: $articleName$ \end
Pragmas, including \define, have to be the very first thing in a tiddler (except for other pragmas). If anything else at all comes before them (except comments), they're treated as normal text.