This is the 6174th most frequent Spanish word.
aniversario
"Aniversario" means "anniversary" in English.
The sentence uses "aniversario" to denote the celebration of a recurring yearly event, specifically related to a wedding.
Celebramos el aniversario de nuestra boda anualmente.
We celebrate our wedding anniversary annually.
"Aniversario" in this context refers to the commemoration of a significant date in relation to a city's history.
El próximo mes será el aniversario de la fundación de la ciudad.
Next month will be the anniversary of the founding of the city.
Here, "aniversario" is used to mark the yearly remembrance of a significant achievement in science.