This is the 12196th most frequent German word.
valentinstags
"Valentinstags" means "Valentine's Day's" (possessive form of Valentine's Day) in English.
The word 'Valentinstag' is used as a proper noun referring specifically to the holiday celebrated on February 14th, Valentine's Day.
Am Valentinstag schenken sich viele Paare kleine Geschenke.
On Valentine's Day, many couples exchange small gifts.
Here, 'Valentinstags' is used in the genitive case, indicating possession or association, as in 'Valentine's Day celebration'.
Das Thema des Buches ist das Valentinstagsfest und seine Traditionen.
The topic of the book is the Valentine's Day celebration and its traditions.
In this sentence, 'Valentinstagspläne' incorporates 'Valentinstags' as part of a compound noun, meaning plans associated with Valentine's Day.