der Rekord
record
The best performance or highest value ever achieved in a specific area, especially in sports.
Der Schwimmer hat einen neuen Weltrekord über 400 Meter aufgestellt.
The swimmer set a new world record in the 400 meters.

record
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record
The best performance or highest value ever achieved in a specific area, especially in sports.
Der Schwimmer hat einen neuen Weltrekord über 400 Meter aufgestellt.
The swimmer set a new world record in the 400 meters.

'Der Rekord' (the record) means a best performance or record achievement. It is not the same as the English 'record' in the sense of music ('die Schallplatte', the vinyl record) or a data record ('der Datensatz').
Sie hält den Rekord im Schnellschwimmen.
She holds the record in speed swimming.
Three fixed verbs are used with 'Rekord' (record): you can 'einen Rekord aufstellen' (set a record), 'brechen' (break it), or 'halten' (hold it).
Die Athletin will den alten Weltrekord brechen.
The athlete wants to break the old world record.
The word 'Rekord-' is often used as the first part of compound words to express that something is an extreme value.
Wegen der Rekordhitze blieben viele Menschen zu Hause.
Because of the record heat, many people stayed at home.
To name the discipline of a sports record, the prepositions 'in' (+ dative) or 'über' (+ accusative) are often used.
Er stellte einen neuen Rekord im Hochsprung auf.
He set a new record in the high jump.
world record
'der Rekord' and 'der Weltrekord' both mean an especially high or best performance. 'Rekord' is more general: it can apply in a club, a school, a city, or even to a weather value. 'Weltrekord' is more specific and means that the performance is the best in the world and is usually officially recognized. Learners may confuse the words because every world record is also a record. But not every record is a world record. If you are not sure whether the performance is the best worldwide, 'Rekord' is safer.

Beim Stadtlauf stellt Lena einen neuen Rekord für ihre Altersgruppe auf.
At the city run, Lena sets a new record for her age group.
Der Schwimmer brach den Weltrekord über 100 Meter Freistil.
The swimmer broke the world record in the 100-meter freestyle.