To take part in a concelebration of the Eucharist.
To take part in (a Eucharist) as a joint celebrant.
To celebrate (the Eucharistic liturgy) jointly, the prayers being said in unison by two or more of the officiating priests.
Origin of concelebrate
- Latin concelebrāre concelebrāt- com- com- celebrāre to celebrate celebrate
From American Heritage Dictionary of the English Language, 5th Edition