Etymology
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apology (n.)
Origin and meaning of apology
early 15c., "defense, justification," from Late Latin apologia, from Greek apologia "a speech in defense," from apologeisthai "to speak in one's defense," from apologos "an account, story," from apo "away from, off" (see apo-) + logos "speech" (see Logos).

In classical Greek, "a well-reasoned reply; a 'thought-out response' to the accusations made," as that of Socrates. The original English sense of "self-justification" yielded a meaning "frank expression of regret for wrong done," first recorded 1590s, but this was not the main sense until 18c. Johnson's dictionary defines it as "Defence; excuse," and adds, "Apology generally signifies rather excuse than vindication, and tends rather to extenuate the fault, than prove innocence," which might indicate the path of the sense shift. The old sense has tended to shift to the Latin form apologia (1784), known from early Christian writings in defense of the faith.
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apologist (n.)
"one who speaks or write in defense of something," especially "a defender of Christianity," 1630s, from French apologiste, from apologie, from Late Latin apologia "a speech in defense" (see apology).
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apologize (v.)
1590s, "to speak in defense of;" see apology + -ize. Sense of "regretfully acknowledge" is attested by 1725. The Greek equivalent, apologizesthai, meant simply "to give an account." Related: Apologized; apologizing; apologizer.
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apologia (n.)

"defense, justification," 1784, the Latin form of apology (q.v.); popularized by J.H. Newman's "Apologia pro Vita Sua" (1864). It preserves the older sense of the English apology and the sense of the Greek original, especially as used by the Church fathers.

In common Greek, apologia refers to the speech that an accused person delivered in court, rejecting the charges filed against him or her. The apologists of the second century chose this term because they wanted to show that the charges filed against Christians were unjustified and that the truths of their faith could be described and defended. An apologia was dedicated to the Roman empoeror, who certainly never read it. [Max L. Stackhouse, "Apologia," 1988]
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*apo- 
also *ap-, Proto-Indo-European root meaning "off, away."

It forms all or part of: ab-; abaft; ablaut; aft; after; apanthropy; aperitif; aperture; apo-; apocalypse; apocryphal; Apollyon; apology; apoplexy; apostle; apostrophe; apothecary; apotheosis; awk; awkward; ebb; eftsoons; of; off; offal; overt.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit apa "away from," Avestan apa "away from," Greek apo "from, away from; after; in descent from," Latin ab "away from, from," Gothic af, Old English of "away from."
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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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excusatory (adj.)

"making excuse; containing an excuse or apology, apologetical," mid-15c., from Old French excusatoire, from Medieval Latin excusatorius, from Latin excusare "excuse, make an excuse for" (see excuse (v.)).

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pardon (v.)

mid-15c., pardounen, "to forgive for offense or sin," from Old French pardoner and Medieval Latin perdonare (see pardon (n.)).

'I grant you pardon,' said Louis XV to Charolais, who, to divert himself, had just killed a man; 'but I also pardon whoever will kill you.' [Marquis de Sade, "Philosophy in the Bedroom"]

Related: Pardoned; pardoning. Pardon me as a phrase used when making apology is by 1764; pardon my French as exclamation of apology for obscene language is by 1895.

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pace (prep.)

"with the leave of, by the permission of," 1863, from Latin pace, ablative of pax "peace," as in pace tua "with all deference to you;" from PIE root *pag- "to fasten." "Used chiefly as a courteous or ironical apology for a contradiction or difference of opinion" [OED]. It is sometimes misused as though it means "according to" instead of the opposite.

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