(1):
(n.) A thing of no account, value, or note; something irrelevant and impertinent; something of comparative unimportance; utter insignificance; a trifle.
(2):
(n.) A cipher; naught.
(3):
(n.) Not anything; no thing (in the widest sense of the word thing); - opposed to anything and something.
(4):
(n.) Nonexistence; nonentity; absence of being; nihility; nothingness.
(5):
(adv.) In no degree; not at all; in no wise.