Definition of nothing :
1. A cipher; naught.
2. A thing of no account, value, or note; something irrelevant and impertinent; something of comparative unimportance; utter insignificance; a trifle.
3. In no degree; not at all; in no wise.
4. Nonexistence; nonentity; absence of being; nihility; nothingness.
5. Not anything; no thing ( in the widest sense of the word thing); - opposed to anything and something.
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zero (part of speech: noun)