Online Etymology Dictionary

reopen (v.): 1733, from re- "again" + open (v.). Related: Reopened; reopening.
reorganization (n.): 1813, noun of action from reorganize.
reorganize (v.): 1680s, from re- "again" + organize (v.). Related: Reorganized; reorganizing.
reorient (v.): 1933 (transitive), 1937 (intransitive), from re- "back, again" + orient (v.). Reorientate is recorded from 1933; reorientation is from 1920.
reovirus (n.): 1959, coined by Dr. Albert B. Savin, acronym for respiratory enteric orphan virus; "orphan" because it was not connected to any of the diseases it is associated with.
rep: 1705 as abbreviation of reputation; as a shortening of repetition it is recorded from 1864, originally school slang; as a shortening of representative (n.), especially "sales representative," it is attested from 1896. As an abbreviation of repertory (company) it is recorded from 1925.
repair (v.1): "to mend, to put back in order," late 14c., from Old French reparer, from Latin reparare "restore, put back in order," from re- "again" (see re-) + parare "make ready, prepare" (see pare). Related: Repaired; repairing. The related noun is attested from 1590s.
repair (v.2): "go" (to a place), c.1300, from Old French repairer "to frequent, return (to one's country)," earlier repadrer, from Late Latin repatriare "return to one's own country" (see repatriate). Related: Repaired; repairing.
reparable (adj.): 1570, from Middle French reparable (16c.), from Latin reparabilis "able to be restored," from reparare "restore" (see repair (v.1)).
reparation (n.): late 14c., "reconciliation," from Late Latin reparationem (nominative reparatio) "act of repairing, restoration," from Latin reparatus, past participle of reparare "restore" (see repair (v.1)). Meaning "act of repairing or mending" is attested from c.1400. Reparations "compensation for war damaged owed by the aggressor" is attested from 1921, from French réparations (1919).
repartee (n.): 1640s, "quick remark," from French repartie "an answering blow or thrust" (originally a fencing term), noun use of fem. past participle of Old French repartir "to reply promptly, start out again," from re- "back" (see re-) + partir "to part, depart, start" (see part (n.)). Meaning "a series of sharp rejoinders exchanged" is from 1680s.
repass (v.): mid-15c., from re- "again" + pass (v.). Related: Repassed; repassing.
repast (n.): c.1300, from Old French repast "a meal," from Late Latin repastus "meal," noun use of past participle of repascere "to feed again," from Latin re- "repeatedly" (see re-) + pascere "to graze" (see pastor).
repatriate (v.): 1610s, from past participle stem of Late Latin repatriare (see repatriation). Related: Repatriated; repatriating.
repatriation (n.): 1590s, from Late Latin reparationem, from past participle stem of repatriare "return to one's own country," from Latin re- "back" (see re-) + patria "native land" (see patriot).
repay (v.): mid-15c. (implied in repayment), from Old French repaier, from re- "back" (see re-) + payer "to pay" (see pay (v.)). Related: Repaid; repaying.
repeal (v.): c.1300, from Anglo-French repeler, Old French rapeler "call back, revoke," from re- "back" (see re-) + apeler "to call" (see appeal (v.)). Related: Repealed; repealing.
repeal (n.): late 15c., from repeal (v.).
repeat (v.): late 14c., from Old French repeter "say or do again, get back, demand the return of" (13c.), from Latin repetere "do or say again; attack again," from re- "again" (see re-) + petere "to go to; attack; strive after; ask for, beseech" (see petition (n.)). Specific meaning "to take a course of education over again" is recorded from 1945, American English. Related: Repeated; repeating.
repeat (n.): 1550s, from repeat (v.).
repeatedly (adv.): 1718, from repeated (past participle adjective from repeat (v.)) + -ly (2).
repel (v.): early 15c., "to drive away, remove," from Old French repeller, from Latin repellere "to drive back," from re- "back" (see re-) + pellere "to drive, strike" (see pulse (n.1)). Meaning "to affect (a person) with distaste or aversion" is from 1817. Related: Repelled; repelling.
repellent (adj.): also repellant, 1640s, from Latin repellentem, present participle of repellere (see repel). Originally of medicines (that reduced tumors); meaning "distasteful, disagreeable" first recorded 1797.
repellent (n.): "substance that repels insects," 1908, from repellent (adj.).
repent (v.): late 13c., "to feel regret for sins or crimes," from Old French repentir (11c.), from re-, here probably an intensive prefix, + Vulgar Latin *penitire "to regret," from Latin poenitire "make sorry," from poena (see penal). The distinction between regret (q.v.) and repent is made in many modern languages, but the differentiation is not present in older periods. Related: Repented; repenting.
repentance (n.): c.1300, from Old French repentance (12c.), from repentir (see repent).
repentant (adj.): late 13c., from Old French repentant (12c.), present participle of repentir (see repent).
repercussion (n.): c.1400 (implied in repercussive) "act of driving back," from Middle French répercussion (14c.), from Latin repercusionem (nominative repercussio), from past participle stem of repercutere "to strike or beat back," from re- "back" (see re-) + percutere "to strike or thrust through" (see percussion). Meaning "reverberation, echo" first recorded 1590s; the metaphoric extension is recorded from 1620s.
repertoire (n.): "a stock of plays, songs, etc.," 1847, from French répertoire, from Late Latin repertorium "inventory" (see repertory).
repertory (n.): 1550s, "index, list, catalogue," from Late Latin repertorium "inventory, list," from Latin repertus, past participle of reperire "to find, get, invent," from re-, intensive prefix, + parire, archaic form of paerere "produce, bring forth," from PIE root *per- "attempt" (see parent). Meaning "list of performances" is first recorded 1845; repertory theater is attested from 1896.
repetition (n.): 1520s, "act of saying over again," from Latin repetitionem (nominative repetitio), from past participle stem of repetere "do or say again" (see repeat (v.)). Of actions, attested from 1590s.
repetitious (adj.): 1670s, from Latin repetit-, past participle stem of repetere (see repeat (v.)) + -ous.
repetitive (adj.): 1839, from Latin repetit-, past participle stem of repetere (see repeat (v.)) + -ive. Related: Repetitively; repetitiveness.
rephrase (v.): 1895, from re- "again" + phrase (v.). Related: Rephrased; rephrasing.
repine (v.): mid-15c., probably from re-, here likely an intensive prefix, + pine (v.) "yearn."
replace (v.): 1590s, "to restore to a previous place," from re- "back, again" + place (v.). Meaning "to take the place of" is recorded from 1733. Related: Replaced; replacing.
replacement (n.): "act or fact of being replaced," 1790, from replace (v.) + -ment. Meaning "something that replaces another" is attested from 1894.
replant (v.): 1570s, from re- "back, again" + plant (v.). Related: Replanted; replanting.
replay (v.): 1884, in sporting jargon, from re- "again" + play (v.). Of recordings, attested from 1922. Related: Replayed; replaying. The noun is from 1895.
replenish (v.): mid-14c., from Old French repleniss-, extended present participle stem of replenir "to fill up," from re-, here probably an intensive prefix, + -plenir, from Latin plenus "full" (see plenary). Related: Replanished; replenishing.
replete (adj.): late 14c., from Old French replet "filled up" (14c.), from Latin repletus, past participle of replere "to fill," from re-, here probably an intensive prefix, + plere "to fill," related to plenus "full" (see pleio-).
repletion (n.): late 14c., from Old French repletion (early 14c.) or directly from Late Latin repletionem, noun of action from past participle stem of replere (see replete).
replevin (n.): "recovery of goods (by someone) taken from him, upon posting of security," mid-15c., from Anglo-French (mid-14c.) and Anglo-Latin (13c.) replevina, from Old French replevir (v.), from re- "back, again" (see re-) + plevir, of uncertain origin; perhaps related to pledge (v.).
replica (n.): 1824, from Italian replica "copy, repetition, reply," from Latin replicare "to repeat" (see reply (v.)). Properly, a copy of a work of art made by the original artist.
replicable (adj.): 1520s, "that may be replied to;" see replicate + -able. Meaning "that may be duplicated" is from 1953.
replicate (v.): 1882, from Latin replicatus, past participle of replicare (see reply). Genetic sense is first recorded 1957. Related: Replicated; replicating.
replication (n.): late 14c., "action of folding back," also "legal reply, rejoinder," from Anglo-French replicacioun, Old French replicacion, from Latin replicationem (nominative replicatio) "a reply, repetition, a folding back," from past participle stem of replicare "to repeat, reply," literally "to fold back" (see reply (v.)). Meaning "copy, reproduction" first recorded 1690s.
reply (v.): late 14c., from Old French replier "to reply, turn back," from Latin replicare "to reply, repeat," literally "fold back," from re- "back, again" + plicare "to fold" (see ply (v.1)). Modern French répliquer is directly from Late Latin. Related: Replied; replying.
reply (n.): 1550s, from reply (v.).
repo: by 1972 (in repo man), American English, short for repossess or repossession.