auspicious event; something to celebrate
A somewhat formal or literary noun for a happy, fortunate occurrence or a cause for celebration. Not an everyday word; more likely in writing or formal speech.
Celebrate the auspiciousness of the new year.
We consider your marriage a truly joyous occasion.
Compound of 吉 (good fortune, auspicious) and 慶 (celebration, joy). The reading きっけい is a regular on'yomi combination with gemination (促音便).