This is the 752nd most frequent Hebrew word.
לציון
"To Zion" or "for marking/indicating."
In this sentence, 'לציון' means 'to mark' and is used to signify the purpose of the celebration.
הייתה חגיגה גדולה לציון יום ההולדת.
There was a big celebration to mark the birthday.
Here, 'לציון' means 'to commemorate' and is used to signify the reason for dedicating the building.
לציון המאורע המיוחד, הוחלט לחנוך את הבניין החדש.
To commemorate the special event, it was decided to inaugurate the new building.
In this example, 'לציון' implies 'in honor of' and is used to indicate the purpose of the exhibition.