A response to a question or statement.

उत्तर

English Usage: She sent a prompt reply to the email.

Hindi Usage: उसने ईमेल का तुरंत उत्तर दिया।

To respond or answer back.

प्रतिक्रिया देना

English Usage: Please reply to the message as soon as possible.

Hindi Usage: कृपया संदेश का जल्द से जल्द प्रतिक्रिया दें।

In response; as a reply.

उत्तर में

English Usage: He spoke in reply to her question.

Hindi Usage: उसने उसके प्रश्न के उत्तर में बात की।