retro-

from The Century Dictionary.

• Backward.
• noun A prefix of Latin origin, meaning ‘back’ or ‘backward,’ ‘behind’: equivalent to post-, and the opposite of ante- (also of pre- or pro-) with reference to place or position, rarely to time; sometimes also equivalent to re- and opposed to pre- or pro-. It corresponds to opistho- in words from the Greek.

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

• A prefix or combining form signifying backward, back.

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

• prefix back or backward
• prefix behind
• prefix in the opposite direction
• prefix informal in an old-fashioned or old-school way

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

• adjective affecting things past
• noun a fashion reminiscent of the past