New Year's Card, Greeting Card
noun
Congratulations on your condition. I'll send you a greeting card to make it official. Though this kind of card is almost always in the form of a New Year's Card.
がじょう
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
甥っ子が高校の入学試験に合格した時に、祝賀状を送りました。
I sent a congratulations card to my nephew when he passed his high school entrance exam.