This is the 2229th most frequent Japanese word.
聖
"聖" means "holy," "sacred," or "saint."
Here, 聖 (saint or holy) is used as part of the compound noun 聖堂, meaning 'cathedral' or 'sanctuary'.
この町には古い聖堂があります。
This town has an old cathedral.
In this sentence, 聖 is used to describe 夜 (night) as 圣夜, translating to 'Holy Night' or 'Christmas Eve' in context.
聖夜には家族と過ごすことが普通です。
It is common to spend the Holy Night with family.
Here, 聖 is used in 聖人, where 人 means person, and together it translates to 'saint' or 'holy person'.