What is the meaning of Cipher?

A numeric character.

Any text character.

A combination or interweaving of letters, as the initials of a name.

A method of transforming a text in order to conceal its meaning.

A cryptographic system using an algorithm that converts letters or sequences of bits into ciphertext.

Ciphertext; a message concealed via a cipher.

A grouping of three digits in a number, especially when delimited by commas or periods:

A fault in an organ valve which causes a pipe to sound continuously without the key having been pressed.

A hip-hop jam session.

The path (usually circular) shared cannabis takes through a group, an occasion of cannabis smoking.

Someone or something of no importance.

Zero.

Eggcorn of siphon.

To calculate.

To write in code or cipher.

Of an organ pipe: to sound independent of the organ.

To decipher.

Source: wiktionary.org