Definition:-

• A thing that is said, written, or done as a reaction to a question, statement, or situation. (noun)
• A solution to a problem or dilemma. (noun)
• A person or thing regarded as the equivalent to a better-known one from another place. (noun)
• Say or write something as a reaction to someone or something. (verb)
• Act in reaction to (a sound such as a phone ringing or a knock or ring on a door) (verb)
• Defend oneself against (a charge, accusation, or criticism) (verb)
• Be suitable for fulfilling (a need); satisfy. (verb)