生誕祭 せいたんさい Meanings Noun birthday celebration (esp. for an idol or fictional character); birthday festival; birthday event birth celebration (e.g. of a deity, religious figure, historical figure); nativity celebration (orig. meaning) Kanji 生 life. Read as セイ. 誕 be born. Read as タン. 祭 festival. Read as サイ. Word lists Internet slang Core 5000 Written Jinuma: Japanese Dictionary · Word lists