1 Definition

symbol
1.
Wiktionary

(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
Wiktionary

(music) Tonic, or the first scale degree.

Wiktionary
adjective
An initial version of something or, figuratively, of someone.
Wiktionary

Of telephone numbers dialed in North America, having an additional charge assessed to the caller, part of which is returned to the owner of the number.

Wiktionary
Synonyms:
noun

(North America) A toll-free number or a long-distance telephone numbers; using any of North American toll-free area codes 800, 888, 877, 866, or 855.

866-555-1234... that's a 1-800 number, isn't it?
Wiktionary
Synonyms:

Origin of 1

  • 1, used to dial long-distance numbers + 800, which was, for a long time, the only North American toll-free area code

    From Wiktionary

  • 1, used to dial long-distance numbers + 900, the North American premium charge area code

    From Wiktionary

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