noun

• An answer or reply, or something in the nature of an answer or reply.
• The act of responding or replying; reply: as, to speak in response to a question.
• An oracular answer.
• (liturgics) A verse, sentence, phrase, or word said or sung by the choir or congregation in sequence or reply to the priest or officiant.
• (liturgics) A versicle or anthem said or sung during or after a lection; a respond or responsory.
• A reply to an objection in formal disputation.
• An online advertising performance metric representing one click-through from an online ad to its destination URL.
• A reaction to a stimulus or provocation.