1. to influence or make a change to something
2. to cause someone to feel strong emotions
3. to pretend to have or feel something
Usage: formal

1. an observable emotional response or mood
Usage: psychology

Examples

• The rain will affect our picnic plans.
• The medication may affect your ability to drive.
• The sad movie deeply affected the audience.
• She was visibly affected by the news.
• He affected a British accent when speaking.
• The patient showed a flat affect during the interview.