divagation (n.)

"a wandering; deviation, digression," 1550s, noun of action from Latin divagatus, past participle of divagari "to wander about," from assimilated form of dis- "apart, in different directions" (see dis-) + vagari "to wander, ramble," from vagus "strolling, wandering, rambling," figuratively "vacillating, uncertain," a word of unknown origin.