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regress (v.)[regress 词源字典]: 1550s, "to return to a former state," from Latin regressus (see regress (n.)). Meaning "to move backward" is from 1823. The psychological sense of "to return to an earlier stage of life" is attested from 1926. Related: Regressed; regressing.[regress etymology, regress origin, 英语词源]
regression (n.): early 15c., from Latin regressionem (nominative regressio) "a going back, a return," noun of action from past participle stem of regredi (see regress (n.)).
regressive (adj.): 1630s; see regress + -ive. In reference to taxation, it is attested from 1889. Related: Regressively.
regret (v.): "to look back with distress or sorrowful longing; to grieve for on remembering," late 14c., from Old French regreter "long after, bewail, lament someone's death; ask the help of" (Modern French regretter), from re-, intensive prefix (see re-), + -greter, possibly from Frankish or some other Germanic source (compare Old English grætan "to weep;" Old Norse grata "to weep, groan"), from Proto-Germanic *gretan "weep." "Not found in other Romance languages, and variously explained" [Century Dictionary].

Related: Regretted; regretting. Replaced Old English ofþyncan, from of- "off, away," here denoting opposition, + þyncan "seem, seem fit" (as in methinks).
regret (n.): "pain or distress in the mind at something done or left undone," 1530s, from the verb, or from Middle French regret, back-formation from regreter (see regret (v.)).
regretful (adj.): 1640s, "full of regret," from regret + -ful. Regretfully, properly "with regret," incorrectly used in place of regrettably "it is to be regretted that; calling for regret" since at least 1965. "A regrettable use, prob. after HOPEFULLY adv.2" [OED].
regrettable (adj.): c. 1600, "deserving of regret," from regret + -able. Related: Regrettably.
regroup (v.): also re-group, 1838, from re- "again" + group (v.). Related: Regrouped; regrouping.
regrowth (n.): 1741, from re- + growth.
regular (adj.): late 14c., from Old French reguler "ecclesiastical" (Modern French régulier), from Late Latin regularis "containing rules for guidance," from Latin regula "rule," from PIE *reg- "move in a straight line" (see regal).

Earliest sense was of religious orders (the opposite of secular). Extended from late 16c. to shapes, etc., that followed predictable or uniform patterns; sense of "normal" is from 1630s; meaning "real, genuine" is from 1821. Old English borrowed Latin regula and nativized it as regol "rule, regulation, canon, law, standard, pattern;" hence regolsticca "ruler" (instrument); regollic (adj.) "canonical, regular."
regular (n.): c. 1400, "member of a religious order," from regular (adj.). Sense of "soldier of a standing army" is from 1756. Meaning "regular customer" is from 1852; meaning "leaded gasoline" is from 1978.
regularity (n.): c. 1600, from Middle French regularite, from Medieval Latin *regularitas, from Latin regularis (see regular (adj.)).
regularize (v.): 1620s, from regular (adj.) + -ize. Related: Regularized; regularizing.
regularly (adv.): 1520s, "at proper times," from regular + -ly (2). Meaning "in accordance with rules" is from 1560s.
regulate (v.): early 15c., "adjust by rule, control," from Late Latin regulatus, past participle of regulare "to control by rule, direct," from Latin regula "rule" (see regular). Meaning "to govern by restriction" is from 1620s. Related: Regulated; regulating.
regulation (n.): 1670s, "act of regulating; state of being reduced to order," noun of action from regulate. Meaning "rule for management" is from 1715. Related: Regulations.
regulator (n.): 1650s, agent noun in Latin form from regulate. In English history, from 1680s; in American history, from 1767, applied to local posses that kept order (or disturbed it) in rural regions. As a mechanical device or clock used to set the time of other pieces, from 1758.
Regulus (n.): bright star in constellation Leo, 1550s, Modern Latin, apparently first so-called by Copernicus, literally "little king," diminutive of rex "king;" probably a translation of Basiliskos "little king," a Hellenistic Greek name for the star, mentioned in Geminos and Ptolemy (in the "Almagest," though elsewhere in his writings it is usually "the star on the heart of Leo"); perhaps a translation of Lugal "king," said to have been the star's Babylonian name. Klein holds it to be a corruption of Arabic rijl (al-asad) "paw of the lion" (compare Rigel).
regurgitate (v.): 1640s (intransitive), 1753 (transitive), back formation from regurgitation, or else from Medieval Latin regurgitatus, past participle of regurgitare. Meaning "to vomit" first attested 1753. Related: Regurgitated; regurgitating.
regurgitation (n.): c. 1600, from Medieval Latin regurgitationem (nominative regurgitatio), noun of action from past participle stem of regurgitare "to overflow," from re- "back" (see re-) + Late Latin gurgitare "engulf, flood" (found in Latin ingurgitare "to pour in"), from gurges "whirlpool, gorge, abyss" (see gurges).