1 meaning

(music) Tonic, or the first scale degree.
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1.
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(Internet slang, leetspeak, sarcastic) Deliberate misspelling of !, imitating noobs who forget to hold down the shift key while typing exclamation marks.

A: sum1 hlep me plz im alwyz l0zin!!1!?!/?

B: Thts bcuz ur st00pid!!!!!11!!oneone!!1!!eleven!1

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One of two states of a binary digit. See logic 0 and binary.
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