The term 'circumduct' is a verb meaning to move in a circle or an arc. The crossword solutions for this term are 'UNDO' (4 letters) and 'INVALIDATE' (10 letters). To UNDO something means to reverse it, while to INVALIDATE something means to make it legally or officially invalid. Therefore, the term 'circumduct' can be interpreted as a combination of these two words, meaning to move in a circle or an arc in order to reverse or INVALIDATE something.