Astro.: → retrograde motion.
Geology: A retreat of the sea from land areas. Possible causes include a drop in
sea level or uplift.
Math.: A method for fitting a curve through a set of points using some
goodness-of-fit criterion. The most common type of regression is
→ linear regression.
Etymology (EN): From L. regression-, from regress-, stem of
regredi “to go back,” from → re- “back” + gradi
“to step, walk.”
Etymology (PE): 1) → retrograde.
2) On the model of → progression, from vâ-→ re- + yâzi, yâzeš, verbal
noun of yâzidan “to stretch out the arms; grow up” (Parthian Mid.Pers. y’d
“to reach a goal, come to, stretch out;” Av. yat- “to reach, take one’s place,”
yaiiata “places,” frā-iiatāt “has reached;” cf. Skt.
yat- “to be in place, put in place, line up;” PIE base *iet- “to be in place”).
