Definition of in celebration of
- We're having a dinner in celebration of their anniversary.
: to perform (a sacrament or solemn ceremony) publicly and with appropriate rites
: to honor (an occasion, such as a holiday) especially by solemn ceremonies or by refraining from ordinary business
: to mark (something, such as an anniversary) by festivities or other deviation from routine
What made you want to look up in celebration of? Please tell us where you read or heard it (including the quote, if possible).