zero

zero

1: indicating the absence of any or all units under consideration; "a zero score"

2: indicating an initial point or origin

3: having no measurable or otherwise determinable value; "the goal is zero population growth"

4: of or relating to the null set (a set with no members)

5: a quantity of no importance; "it looked like nothing I had ever seen before"; "reduced to nil all the work we had done"; "we racked up a pathetic goose egg"; "it was all for naught"; "I didn't hear zilch about it"

6: a mathematical element that when added to another number yields the same number

7: the quantity that registers a reading of zero on a scale

8: adjust (as by firing under test conditions) the zero of (a gun); "He zeroed in his rifle at 200 yards"

9: adjust (an instrument or device) to zero value