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A cipher is a secret code — a system for writing a message so only people who know the "key" can read it, used to keep information hidden, like in spy stories or old wartime messages. There's also a figurative use: calling a person "a cipher" means they have no real importance or influence, like a zero — someone easily overlooked.
密碼、暗號；（比喻）無足輕重的人
組成From Arabic "sifr," meaning "zero" or "empty" — the same root that gives us the word "zero."
同家族的字
- zerocipher and zero both come from the same Arabic root, sifr, meaning empty or nothing
原始詞典資料16 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
ciphernoun/ˈsaɪfə/
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A numeric character.
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Any text character.
- In ſucceeding times this vnderſtanding wiſedome began to be written in Ciphers, and Characters, and letters bearing the forme of beaſtes, birds, and other creatures; […]
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A combination or interweaving of letters, as the initials of a name.
- a painter's cipher
- an engraver's cipher
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A method of transforming a text in order to conceal its meaning.
- The message was written in a simple cipher. Anyone could figure it out.
- He was very early engaged in great ſecrets: For his fatherr, apprehending of what fatal conſequence it would have been to the King’s affairs if his correſpondence had been diſcovered by unfaithful Secretaries, engaged him when very young to write all his letters to England in cypher; ſo that he was generally half the day writing in cypher, or decyphering, and was ſo diſcrect, as well as faithful, that nothing was ever diſcovered by him.
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computingcryptographyengineeringA cryptographic system using an algorithm that converts letters or sequences of bits into ciphertext.
- a public-key cipher
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Ciphertext; a message concealed via a cipher.
- The message is clearly a cipher, but I can't figure it out.
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A grouping of three digits in a number, especially when delimited by commas or periods
- The probability is 1 in 1,000,000,000,000,000 — a number having five ciphers of zeros.
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entertainmentlifestylemusicA fault in an organ valve which causes a pipe to sound continuously without the key having been pressed.
另外 4 個記錄的用法
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slangentertainmentlifestylemusicA hip-hop jam session.
- They say no girls in the cipher, so I rock solo
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slangThe path (usually circular) shared cannabis takes through a group, an occasion of cannabis smoking.
- As the night seemed darker, cops is on a hunt / They interrupt your cipher, and crush your blunt
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Someone or something of no importance.
- There he was a mere cypher: here he was lord of the ascendant; the choice spirit, the dominant genius.
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datedZero.
- O pardon: ſince a crooked Figure may / Atteſt in little place a Million, / And let vs, Cyphers to this great Accompt, / On your imaginarie Forces worke.
- Firſt, Find what Decimal of a Pound .625 will Repreſent, which is eaſily done if you prepone a Cypher, and half the Number is the Decimal of a Pound. The Number with a Cypher preponed is .0625, ½ is .03125.
cipherverb/ˈsaɪfə/
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datedregionalTo calculate.
- I never learned much more than how to read and cipher.
- For the mischief that one blockhead, that every blockhead does, in a world so feracious, teeming with endless results as ours, no ciphering will sum up.
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To write in code or cipher.
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entertainmentlifestylemusicOf an organ pipe: to sound independent of the organ.
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obsoleteTo decipher.
- Yea the illiterate that know not how To cipher what is writ in learned bookes, VVill cote my lothſome treſpaſſe in my lookes.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。