Etymology
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legate (n.)

mid-12c., "authorized representative of the Pope," from Old French legat and directly from Latin legatus "ambassador, envoy," originally "provided with a commission," past participle of legare "send as a deputy, send with a commission, charge, bequeath," possibly literally "engage by contract" and related to lex (genitive legis) "contract, law," from PIE root *leg- (1) "to collect, gather." General sense of "ambassador, delegate, messenger of a state or authority" is from late 14c. in English. Related: Legator; legatee; legatine.

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legation (n.)
c. 1400, "mission of a deputy or envoy," from Old French legation "embassy, mission" and directly from Latin legationem (nominative legatio) "the office of an ambassador," noun of action from past participle stem of legare "send as a deputy" (see legate). From c. 1600 as "body of deputies sent, representatives," 1832 as "official residence of a diplomat."
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ablegation (n.)
Origin and meaning of ablegation

"act of sending abroad or away," 1610s, from Latin ablegationem (nominative ablegatio) "a sending off or away," noun of action from past-participle stem of ablegare "send away on a commission," from ab "off, away from" (see ab-) + legare "send with a commission, send as an ambassador" (see legate).

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legacy (n.)
late 14c., legacie, "body of persons sent on a mission," from Medieval Latin legatia, from Latin legatus "ambassador, envoy, deputy," noun use of past participle of legare "send with a commission, appoint as deputy, appoint by a last will" (see legate).

Sense of "property left by will, a gift by will" appeared in Scottish mid-15c. Legacy-hunter is attested from 1690s. French legs "a legacy" is a bad spelling of Old French lais (see lease (n.)). French legacie is attested only from 16c.
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allege (v.)
c. 1300, "make a formal declaration in court;" mid-14c., "pronounce positively, claim as true," with or without proof; it has the form of one French verb and the meaning of another. The form is Anglo-French aleger, Old French eslegier "to clear at law" (from a compound of Latin ex "out of;" see ex- + litigare "bring suit" (see litigation).

However eslegier meant "acquit, clear of charges in a lawsuit," and the Middle English word somehow acquired the meaning of French alléguer, from Latin allegare/adlegare "send for, bring forth, name, produce in evidence, send on business," from ad "to" (see ad-) + legare "to depute, send" (see legate). Related: Alleged; alleging.
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*leg- (1)

Proto-Indo-European root meaning "to collect, gather," with derivatives meaning "to speak" on the notion of "to gather words, to pick out words."

It forms all or part of: alexia; analects; analogous; analogue; analogy; anthology; apologetic; apologue; apology; catalogue; coil; colleague; collect; college; collegial; Decalogue; delegate; dialect; dialogue; diligence; doxology; dyslexia; eclectic; eclogue; elect; election; epilogue; hapax legomenon; homologous; horology; ideologue; idiolect; intelligence; lectern; lectio difficilior; lection; lector; lecture; leech (n.2) "physician;" legacy; legal; legate; legend; legible; legion; legislator; legitimate; lesson; lexicon; ligneous; ligni-; logarithm; logic; logistic; logo-; logogriph; logopoeia; Logos; -logue; -logy; loyal; monologue; neglect; neologism; philology; privilege; prolegomenon; prologue; relegate; sacrilege; select; syllogism; tautology; trilogy.

It is the hypothetical source of/evidence for its existence is provided by: Greek legein "to say, tell, speak, declare; to count," originally, in Homer, "to pick out, select, collect, enumerate;" lexis "speech, diction;" logos "word, speech, thought, account;" Latin legere "to gather, choose, pluck; read," lignum "wood, firewood," literally "that which is gathered," legare "to depute, commission, charge," lex "law" (perhaps "collection of rules"); Albanian mb-ledh "to collect, harvest;" Gothic lisan "to collect, harvest," Lithuanian lesti "to pick, eat picking;" Hittite less-zi "to pick, gather."

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exarch (n.)

historically, "a ruler of a province in the Byzantine Empire;" in the early Church, "a prelate presiding over a diocese;" in the Greek Church, a legate of a patriarch; from Late Latin exarchus, from Greek exarkhos "a leader," from ex (see ex-) + arkhos "leader, chief, ruler" (see archon). Related: Exarchate.

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