Noun
1. a mathematical element that when added to another number yields the same number
2. 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"3. a person of no influence
4. a secret method of writing
5. a message written in a secret code