Is there a way of defining a command that can be executed only once and is then redefined to be a no-op?



An easy way is to just nullify the macro within the body so that the next time it does not have an effect if it is called again via either




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As per David Carlisle's comment, we need to add a \global to ensure that the macro is nullified for subsequent use in the case the first use was within a group (as per updated test case below)




    \textbf{FirstTime: }%

    abcd \FirstTime defg \FirstTime xys

    abcd \FirstTime defg \FirstTime xys

    abcd \FirstTime defg \FirstTime xys

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