Etymology
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mpg 
originally m.p.g., abbreviation of miles per gallon, attested from 1912.
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pervasive (adj.)

tending or having the power to pervade," "1750, with -ive + Latin pervas-, past-participle stem of pervadere "spread or go through," from per "through" (from PIE root *per- (1) "forward," hence "through") + vadere "to go" (see vamoose). Related: Pervasively; pervasiveness.

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select (adj.)

1560s, "chosen on account of special excellence or fitness," from Latin selectus, past participle of seligere "choose out, single out, select; separate, cull," from se- "apart" (see se-) + legere "to gather, select" (from PIE root *leg- (1) "to collect, gather").

"Carefully picked," hence "choice, of special excellence" (by 1580s). Related: Selectly; selectness. The noun meaning "a selected person or thing, that which is choice" is recorded from c. 1600.

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ppm 

also p.p.m., abbreviation of parts per million, attested by 1913.

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permeate (v.)

"to pass into or through without rupture or displacement," 1650s, from Latin permeatus, past participle of permeare "to pass through," from per "through" (from PIE root *per- (1) "forward," hence "through") + meare "to pass," from PIE root *mei- (1) "to change, go, move." Related: Permeated; permeating.

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semee (adj.)

"covered with a small, constantly repeating pattern," 1560s, from French semée "strewn, sprinkled," past participle of semer, from Latin seminare "to sow," from semen (genitive seminis) "seed" (from PIE root *sē- "to sow").

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pervade (v.)

"to pass or flow through; to extend or diffuse (itself) throughout," 1650s, from Latin pervadere "spread or go through," from per "through" (from PIE root *per- (1) "forward," hence "through") + vadere "to go" (see vamoose). Related: Pervaded; pervading; pervasion.

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perfusion (n.)

"a pouring through, a causing to permeate," 1570s, from French perfusion and directly from Latin perfusionem (nominative perfusio) "a pouring over," noun of action from past-participle stem of perfundere "pour out," from per "throughout" (from PIE root *per- (1) "forward," hence "through") + fundere "to pour" (from nasalized form of PIE root *gheu- "to pour").

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perfidy (n.)

"breach of faith or trust, base treachery," 1590s, from French perfidie (16c.), from Latin perfidia "faithlessness, falsehood, treachery," from perfidus "faithless," from phrase per fidem decipere "to deceive through trustingness," from per "through" (from PIE root *per- (1) "forward," hence "through") + fidem (nominative fides) "faith" (from PIE root *bheidh- "to trust, confide, persuade").

[C]ombinations of wickedness would overwhelm the world by the advantage which licentious principles afford, did not those who have long practiced perfidy grow faithless to each other. [Samuel Johnson, "Life of Waller"]
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perambulate (v.)

"walk through, about, or over," 1560s, from Latin perambulatus, past participle of perambulare "to walk through, go through, ramble through," from per "through" (from PIE root *per- (1) "forward," hence "through") + ambulare "to walk, go about" (see amble (v.)). Related: Perambulated; perambulating.

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