The processional was "Praise, My Soul, the King of Heaven" or "The Queen's Processional". You can hear me play it by searching "You Tube" under "Geoff Olson Queen's Processional".

I think it's the person who carries the processional cross (in various Christian churches). If you meant "cruciferous", it's a botanical term.

Although it will vary some from parish to parish and depending upon the type of Mass to be celebrated, a cross bearer usually leads the procession.

The processional entrance you're thinking of is called an ovation.

Many composers have used the word 'processional' as part of their titles. Asker needs to be more specific in the information being sought.