1. in a way that produces the desired result; effectively
Usage: formal

Examples

• The new medication worked efficaciously to reduce her symptoms.
• The team collaborated efficaciously to complete the project ahead of schedule.
• The teacher explained the concept efficaciously, and all students understood.
• The marketing campaign efficaciously increased brand awareness.
• The diplomat negotiated efficaciously to reach a peaceful agreement.
• The software update efficaciously resolved the security issues.