This is the 3221st most frequent German word.
ex
"Ex" in German refers to an ex-partner or ex-spouse.
In this sentence, 'Ex' is used as a noun, short for 'Ex-Partner' or 'Ex-Freund', referring to a former romantic partner.
Ich habe meinen Ex letzte Woche im Park getroffen.
I met my ex last week in the park.
In this context, 'Ex' is used as a prefix indicating that it was part of a former concert or event category.
Die Band hat ihren neuen Song als Ex-Konzert vorgestellt.
The band showcased their new song as part of the ex-concert.
Here, 'Ex' is used to denote a particular type of exercise, likely emphasizing its distinction.