1. in a way that produces the desired result; successfully
2. in reality; in actual fact (used to emphasize what is really the case)

Examples

• The new teaching method works effectively with young students.
• She communicated her ideas effectively during the presentation.
• The medicine effectively reduced his symptoms within hours.
• The company effectively controls the entire market.
• This policy effectively eliminates the problem we were facing.
• He effectively became the leader after the resignation.
• The team worked together effectively to meet the deadline.