code / codex
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code
A collection of rules, norms, or principles that define behavior within a particular group, profession, or society. Often these are unwritten laws.
Journalisten müssen sich an einen strengen ethischen Kodex halten.
Journalists must adhere to a strict ethical code.
You can recognize the meaning from the context. If it is about rules, ethics, or behavior (e.g., in a profession), it refers to a code of conduct. If it is about history, books, or manuscripts, it refers to the old book form.
Der Presseverband hat einen neuen Kodex für den Umgang mit Quellen veröffentlicht.
The press association has published a new code for dealing with sources.
'Kodex' (code/codex) is a word from Latin and is mainly used in formal, academic, or specialized contexts. It is rather rare in everyday colloquial speech.
Der Ehrenkodex der Ritter war sehr streng.
The knights' code of honor was very strict.
In connection with rules of conduct, 'Kodex' (code) is often used with certain verbs: you can 'sich an einen Kodex halten' (adhere to a code), 'gegen einen Kodex verstoßen' (violate a code), or 'einen Kodex festlegen' (establish a code).
Wer gegen den Kodex verstößt, muss mit Konsequenzen rechnen.
Anyone who violates the code must expect consequences.
order
'die Ordnung' and 'der Kodex' can both describe rules for behavior. 'Ordnung' is a broad word for a system of rules or principles. 'Kodex' more often means a collection of principles that a particular group follows, for example a profession or a community. 'Kodex' often sounds somewhat more formal and can also refer to unwritten rules. The words can be confused because both describe how people are supposed to behave. For a general system of rules, 'Ordnung' fits better; for shared values or rules of conduct in a group, 'Kodex' is more appropriate.
Für viele Ärztinnen und Ärzte ist der berufliche Kodex sehr wichtig.
For many doctors, the professional code is very important.
In einer großen Gemeinschaft braucht man eine klare Ordnung.
In a large community, you need clear order.