Definitions from Wiktionary ( )

▸ adjective:  Directed or moving backwards in relation to the normal or previous direction of travel; retreating.
▸ adjective:  Reverting to an inferior or less developed state; declining, regressing.
▸ adjective:  (zoology) Of an animal: appearing to regress to a less developed form during its lifetime.
▸ adjective:  Of the order of something: inverse, reverse.
▸ adjective:  (music) Having a passage of music played backwards.
▸ adjective:  Of ideas or a person: opposing social reform, favouring the maintenance of the status quo; conservative.
▸ adjective:  (archaic)
▸ adjective:  Involving a return to or a retracing of a previous course of travel.
▸ adjective:  Counterproductive to a desired outcome; contradictory, contrary.
▸ adjective:  (astronomy)
▸ adjective:  Of a celestial body orbiting another: in the opposite direction to the orbited body's spin.
▸ adjective:  (also astrology, often postpositive) Of a celestial body: seeming to move across the sky in the opposite direction from its ordinary movement.
▸ adjective:  (geology) Of a metamorphic change: resulting from a decrease in pressure or temperature.
▸ adjective:  (medicine) Of amnesia: relating to the period leading up to the episode which caused it.
▸ adjective:  (poetry, archaic) Of verse: reading the same forwards or backwards; palindromic.
▸ adverb:  In a reverse direction; backwards.
▸ noun:  A movement backwards or opposite to the intended or normal motion.
▸ noun:  (astrology) The apparent movement of a planet across the sky in the opposite direction from its ordinary movement.
▸ noun:  One who opposes social reform, favouring the maintenance of the status quo; a conservative.
▸ noun:  (archaic) One who reneges on an agreement, or switches loyalties; a rebel, a renegade.
▸ noun:  (music) The reversal of a melody so that what is played first in the original melody is played last, and what is played last in the original melody is played first.
▸ verb:  (transitive)
▸ verb:  (geography) To cause (a land feature such as a coastline or waterfall) to undergo retrogradation, that is, to travel in the direction of the land or upstream due to erosion.
▸ verb:  (geology) To change (minerals, rocks, etc.) metamorphically through a decrease in pressure or temperature.
▸ verb:  (obsolete) To cause (someone or something) to revert to an inferior or less developed state.
▸ verb:  (intransitive)
▸ verb:  To revert to an inferior or less developed state; to decline, to regress.
▸ verb:  (astrology, astronomy) Of a celestial body, especially a planet: to show retrogradation; to seem to move across the sky in the opposite direction from its ordinary movement.
▸ verb:  (geography) Of a land feature: to travel in the direction of the land or upstream due to erosion.
▸ verb:  (military) To retreat or withdraw from a position.
▸ verb:  (obsolete)
▸ verb:  To move backwards; to recede.
▸ verb:  Of the telling of an incident, etc.: to move to an earlier time.

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