processionally

All riding before the venerable Religious Brethren of the Abbey of Saint Rhemigius, attired in white Aulbes, with the Crosse and Torchlight, singing Processionally, and the two Chauntres cloathed in Coapes, each bearing a Staffe of Siluer.

1623, André Favyn, translated by Anthony Munday, The Theater of Honour and Knight-hood, or, A Compendious Chronicle and Historie of the Whole Christian World, London, Book 2, Chapter 14, p. 306

She had formed pretty notions, how charmingly it would look to have a penitent of her own making, dangling at her side, to church, thro’ an applauding neighbourhood: And, as their family increased, marching with her thither, at the head of their boys and girls, processionally, as it were, boasting of the fruits of their honest desires, as my good Lord Bishop has it in his Licence.

1748, [Samuel Richardson], “Letter I”, in Clarissa. Or, The History of a Young Lady: […], volume VI, London: […] S[amuel] Richardson; [a]nd sold by John Osborn, […], →OCLC, page 2

I went up the steps amongst them, the only human thing, for men and women worship no more in Arras Cathedral, and the trees have come instead; little humble things, all less than four years old, in great numbers thronging the steps processionally, and growing in perfect rows just where step meets step.

1916, Lord Dunsany, Unhappy Far-Off Things