Recessional (noun)

1. A hymn or piece of music played during the recessional, a procession or retreat at the end of a religious or formal ceremony.
2. Something that recedes, withdraws, or moves away.

Origin:

From recess + -ional, meaning "having to do with a recess or retreat".

Examples:

1. The bride and groom made their exit to the sounds of the recessional.
2. The recessional was a lively tune that lifted the mood of the crowd.
3. The recessional was a traditional piece that had been played at countless weddings before.
4. The recessionals of the church were played by the organist, who was an accomplished musician.
5. The recessionals marked the end of the ceremony and signaled the beginning of the reception.