responsive

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Answering or replying; responding.
• adjective Readily reacting to suggestions, influences, appeals, or efforts.
• adjective Containing or using responses.

from The Century Dictionary.

• Answering; correspondent; suited to something else; being in accord.
• Responsible; answerable.
• Able, ready, or inclined to respond or answer; answering; replying.
• Characterized by the use of responses: as, a responsive service of public worship.
• In law, pertinent in answer; called for by the question: as, a party is not bound by an answer given by his own witness if it is not responsive to the question, but may have the irresponsive matter struck out.
• noun An answer; a response; a reply.

from the GNU version of the Collaborative International Dictionary of English.

• adjective That responds; ready or inclined to respond.
• adjective Suited to something else; correspondent.
• adjective obsolete Responsible.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective Answering, replying or responding.
• adjective Able to receive and respond to external stimuli.
• adjective Using antiphons; antiphonal.
• adjective Susceptible to the feelings of others.
• adjective obsolete Suited to something else; correspondent.
• adjective obsolete responsible

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• adjective readily reacting or replying to people or events or stimuli; showing emotion
• adjective containing or using responses; alternating
• adjective reacting to a stimulus