Errance translates to "wandering" or "aimless roaming." It's a more evocative and formal word than simply saying "travel" or "walk," carrying a sense of being lost or without direction.
In the context of Christophe Willem's song "Tiens Bon" (Hold On), it appears in the line "Les années d'errance" (The years of wandering). This suggests a period of life marked by uncertainty, searching, or perhaps even hardship, making it a poignant and memorable word that captures the song's theme of resilience despite life's challenges.