1 [C,U] a system of words, letters, numbers, etc that are used instead of the real letters or words to make a message or information secret 密码: They managed to break/crack the enemy code(= find out what it means). 他们成功地破译了敌方密码。They wrote letters to each other in code. 他们用密码通信。 ☞Look at decode. 参看decode。

2 [C] a group of numbers, letters, etc that is used for identifying sth 代号；代码: What's the code(= the telephone number)for Stockholm? 斯德哥尔摩的电话代号是什么？ ☞Look at bar code. 参看bar code。

3 [C] a set of rules for behaviour 守则；法规: a code of practice(= a set of standards agreed and accepted by a particular profession) 专业守则the Highway Code(= the rules for driving on the roads) 公路法规

4 [U] (computing计算机技术) instructions used to form computer programs 代码（用于构建计算机程序）: segments of code 代码段