1. a person or organization who has power and influence; something or someone whose influence or power must be considered; someone or something that is important and powerful and must not be ignored

1. He has become a force to be reckoned with in politics.

2. I underestimated the influence of Mr. Franklin in this company. He certainly is a force to be reckoned with.

3. Catherine seemed to be a gentle person, but when Roger angered her, she lashed out at him. He discovered she was a force to be reckoned with.

4. Walter is a force to be reckoned with. Be pre- pared to deal with him.