1. To observe (a day) or to commemorate (an event) with ceremonies or festivities.
2. To make known publicly; to proclaim.
3. To praise widely or to present to widespread and favorable public notice, as through newspapers or novels: Frank wrote a novel celebrating the joys of being single.
4. To perform with appropriate rites and ceremonies in a religious observance; to solemnize.
5. To have or participate in a party, a drinking spree, or an uninhibited good time: Mark and his guests look like they were celebrating all night.
6. Taking part in special enjoyable activities in order to show that a particular occasion is important.