to register / notice
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to register
To enter yourself or someone else officially in a list or register, for example for a course, an event, or with a public authority.
Um an der Konferenz teilzunehmen, müssen Sie sich online registrieren.
To take part in the conference, you must register online.
to notice
To notice, perceive, or take note of something. You become aware of a piece of information or a process.
Er war so in seine Arbeit vertieft, dass er gar nicht registrierte, wie spät es geworden war.
He was so absorbed in his work that he didn't even notice how late it had gotten.
to record
To capture and record data or measurements with a technical device.
Der Flugschreiber registriert alle wichtigen Daten während des Fluges.
The flight recorder records all important data during the flight.
Verbs ending in '-ieren' are often borrowed from other languages. They are always weak verbs and form the past participle without the prefix 'ge-'. So it is 'hat registriert' (has registered), not 'hat geregistriert'.
Ich habe mich für den Newsletter registriert.
I registered for the newsletter.
You can recognize the meaning from the context. If it is about signing up, it is often used reflexively ('sich registrieren' (to register oneself)). If it is about perception, a subordinate clause often follows. In a technical context, the subject is usually a device.
Bitte registrieren Sie sich am Empfang.
Please register at reception.
In the meaning 'sich anmelden' (to sign up/register), 'registrieren' is used reflexively with 'sich'. To state the purpose of the registration, German often uses the preposition 'für' followed by the accusative.
Ich möchte mich für den Marathon registrieren.
I would like to register for the marathon.
When 'registrieren' means 'bemerken' (to notice), the object is very often a subordinate clause. This is typically introduced by 'dass' (that) or a wh-question word (how, what, when).
Sie registrierte mit Erstaunen, dass ihr Kollege eine neue Frisur hatte.
She noticed with astonishment that her colleague had a new hairstyle.
to notice / remark
Bemerken and registrieren can both express consciously becoming aware of information. Bemerken is neutral and common in everyday speech, while registrieren often sounds more detached and somewhat formal. Use bemerken in normal conversation and registrieren in a more factual presentation.
Im Protokoll registrierte ich die kleine Änderung sofort.
I recorded the small change in the report immediately.
Ich bemerkte die kleine Änderung sofort.
I noticed the small change immediately.
