Involving just one operand (5)
I believe the answer is:
unary
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">involving just one operand</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Another definition for unary that I've seen is " Single".)
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