This adjective describes what has been formally appointed or set by authority. In Acts 12:21, it qualifies the day Herod chose for his public appearance—a day 'appointed' for official business. Classical usage included fixed payments, prescribed quantities, and set dates. The term implies deliberate designation rather than random selection. Spanish 'señalado' (marked, designated) and German preserving the Greek form both point to official appointment. This is calendared intentionality, not spontaneous action.