What is the meaning of code?

noun

• A set of rules or principles or laws (especially written ones.
  • synonyms: codification
• A coding system used for transmitting messages requiring brevity or secrecy.
• Computer science. ( the symbolic arrangement of data or instructions in a computer program or the set of such instructions)
  • synonyms: computer code

verb

• Attach a code to.
  • usage: "Code the pieces with numbers so that you can identify them later"
• Convert ordinary language into code.
  • usage: "We should encode the message for security reasons"
  • synonyms: encipher, cipher, cypher, encrypt, inscribe, write in code