a mathematical element that when added to another number yields the same number
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"
a person of no influence
a secret method of writing
a message written in a secret code
Verb:
convert ordinary language into code;
"We should encode the message for security reasons"