preparingly

Adverb

1. By way of preparation; anticipatorily.
   • […] prepare for the climax — it is reached ; to the platform's end he walks preparingly; muscles harden, and forehead-veins are full […] - 1856, Henry Fowler, The American Pulpit, page 207:
   • It was proved to us that in the Faculty meetings he would cast his vote in a given way, and then go to the students, and preparingly to keeping on friendly terms with them, would insinuate that he voted differently; […]...