Etymology
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antecedent (n.)

late 14c. in grammar ("noun to which a pronoun refers") and in logic ("if A is, then B is;" A is the antecedent, B the consequent), from Old French antecedent (14c.) or directly from Latin antecedentem (nominative antecedens), noun use of present participle of antecedere "go before, precede," from ante "before" (from PIE root *ant- "front, forehead," with derivatives meaning "in front of, before") + cedere "to yield" (from PIE root *ked- "to go, yield").

Hence "an event upon which another follows" (1610s). As an adjective in English from c. 1400. Related: Antecedently.

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consequent (n.)

"a thing which follows from a cause," 1610s, from a more precise sense in logic, "that which follows logically from a premise" (late 14c.; compare antecedent), a sense now in consequence. For etymology, see consequent (adj.). Mathematical sense is from 1560s.

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antecedence (n.)
1650s, "fact or act of coming before (another or others) in time, place, or order," from Latin antecedens "a going before" (see antecedent). From 1660s in specific sense in astronomy, "apparent contrary motion of a planet" (from east to west). Related: Antecedency (1590s).
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*ked- 
Proto-Indo-European root meaning "to go, yield."

It forms all or part of: abscess; accede; access; ancestor; antecede; antecedent; cease; cede; cession; concede; decease; exceed; excess; incessant; intercede; necessary; precede; predecessor; proceed; recede; recess; recession; secede; secession; succeed; success.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit sedhati "to drive, chase away;" Avestan apa-had- "turn aside, step aside;" Latin cedere "to yield, give place; to give up some right or property," originally "to go from, proceed, leave;" Old Church Slavonic chodu "a walking, going," choditi "to go."
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*ant- 
Proto-Indo-European root meaning "front, forehead," with derivatives meaning "in front of, before; end." Also see *ambhi-.

It forms all or part of: advance; advantage; along; ancestor; ancient (adj.); answer; Antaeus; ante; ante-; ante meridiem; antecede; antecedent; antedate; antediluvian; ante-partum; antepenultimate; anterior; anti-; antic; anticipate; anticipation; antique; antler; avant-garde; elope; end; rampart; un- (2) prefix of reversal; until; vambrace; vamp (n.1) "upper of a shoe or boot;" vanguard.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit antah "end, border, boundary;" Hittite hanti "opposite;" Greek anta, anten "opposite," anti "over against, opposite, before;" Latin ante (prep., adv.) "before (in place or time), in front of, against;" Old Lithuanian anta "on to;" Gothic anda "along;" Old English and- "against;" German ent- "along, against."
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presupposition (n.)

1530s, "surmise, conjecture, supposition antecedent to knowledge," from French présupposition and directly from Medieval Latin praesuppositionem (nominative praesuppositio), noun of action from past-participle stem of Latin praesupponere, from prae "before" (see pre-) + suppositio (see suppose). Meaning "postulation as of an antecedent condition," hence "a prerequisite" is from 1570s.

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foregoing (adj.)
mid-15c., "preceding, antecedent, going before in time or place," present-participle adjective from forego. As a noun from 1660s.
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precondition (n.)

"an antecedent condition, a condition requisite in advance," 1825, from pre- "before" + condition (n.). As a verb from 1841. Related: Preconditioned; preconditioning.

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prefiguration (n.)

"a figuring beforehand, antecedent representation by similitude," late 14c., prefiguracioun, from Late Latin praefigurationem (nominative praefiguratio) "a figuring beforehand," noun of action from past-participle stem of praefigurare "to prefigure" (see prefigure).

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prehistoric (adj.)

also pre-historic, "of or pertaining to times before recorded history, existing in or relating to time antecedent to the beginning of recorded history," 1851, perhaps modeled on French préhistorique; see pre- + historic. Related: Prehistorical.

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