noun
( -s )
Etymology: Latin peragration-, peragratio action of wandering or traversing, from peragratus (past participle of peragrare to wander, traverse, from the phrase per agros through fields, from per through + agros, accusative plural of agr-, ager field) + -ion-, -io -ion — more at for , acre
obsolete : an act of traversing ; specifically : a sidereal revolution of the moon