This is the 581st most frequent Danish word.
sommeren
"The summer."
Here, 'sommeren' refers to the particular season of summer in a possessive sense to indicate a preference.
Sommeren er min yndlingsårstid.
Summer is my favorite season.
In this sentence, 'sommeren' is used to specify the time period during the summer season.
Vi tilbringer sommeren i vores sommerhus.
We spend the summer in our summerhouse.
The phrase 'I løbet af sommeren' frames 'sommeren' as a span of time, marking it as a period within which events occur.