1. in an effective manner (Freq. 12) - these are real problems that can be dealt with most effectively by rational discussion • Syn: efficaciously • Ant: ineffectively, inefficaciously (for: efficaciously) • Derived from adjective: effective, efficacious (for: efficaciously) 2. in actuality or reality or fact (Freq. 1) - she is effectively his wife - in effect, they had no choice • Syn: in effect • Derived from adjective: effective