A response or reply; something said or done in reaction to a statement or question.
A solution to a problem.
Someone or something that fills a similar role or position.
A document filed in response to a complaint, responding to each point raised in the complaint and raising counterpoints.

To make a reply or response to.
To speak in defence against; to reply to in defence.
To respond to a call by someone at a door or telephone, or other similar piece of equipment.
To suit a need or purpose satisfactorily.
To be accountable or responsible; to make amends.
To file a document in response to a complaint.
To correspond to; to be in harmony with; to be in agreement with.
To be opposite, or to act in opposition.
To be or act in conformity, or by way of accommodation, correspondence, relation, or proportion; to conform; to correspond; to suit; usually with to.
To respond to satisfactorily; to meet successfully by way of explanation, argument, or justification; to refute.
To be or act in compliance with, in fulfillment or satisfaction of, as an order, obligation, or demand.
(obsolete) To render account to or for.
(obsolete) To atone for; to be punished for.
(obsolete) To be or act as an equivalent to, or as adequate or sufficient for; to serve for; to repay.