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per annum [per annum 词源字典]: Latin, literally "by the year," from per (see per) + annum, accusative singular of annus "year" (see annual).[per annum etymology, per annum origin, 英语词源]
per capita: Latin, literally "by the head," from per (see per) + capita "head" (see capital).
per diem: Latin, literally "by the day," from per (see per) + diem, accusative singular of dies "day" (see diurnal). As a noun from 1809.
per se: Latin, literally "by itself;" translating Greek kath auto (Aristotle).
per stirpes: Latin, "by families, by stocks;" in legal use, for inheritances, etc., opposed to per capita.
per-: word-forming element meaning "through, throughout; thoroughly; entirely, utterly," from Latin preposition per (see per (prep.)).
peradventure (adv.): 1620s, from Middle English peraventure (mid-15c.), from per auenture (late 13c.), from Old French par aventure (see adventure). Refashioned as though from Latin.
perambulate (v.): 1560s, from Latin perambulatus, past participle of perambulare "to walk through, go through, ramble through," from per- "through" (see per) + ambulare "to walk" (see amble). Related: Perambulated; perambulating.
perambulation (n.): mid-15c., from Anglo-Latin (c. 1300) and Anglo-French perambulacion, from Medieval Latin perambulationem (nominative perambulatio), noun of action from past participle stem of Latin perambulare (see perambulate).
perambulator (n.): 1610s, "one who perambulates," agent noun in Latin form from perambulate. Sense of "baby carriage" is first recorded 1856; often colloquially shortened to pram.
percale (n.): 1620s, name of a fabric imported from the East; in modern use, 1840, from French percale, perhaps ultimately from Persian pargalah "a rag."
perceivable (adj.): late 15c., from Old French percevable, from perçoivre (see perceive). Related: Perceivably.
perceive (v.): c. 1300, via Anglo-French parceif, Old North French *perceivre (Old French perçoivre) "perceive, notice, see; recognize, understand," from Latin percipere "obtain, gather, seize entirely, take possession of," also, figuratively, "to grasp with the mind, learn, comprehend," literally "to take entirely," from per "thoroughly" (see per) + capere "to grasp, take" (see capable).

Replaced Old English ongietan. Both the Latin senses were in Old French, though the primary sense of Modern French percevoir is literal, "to receive, collect" (rents, taxes, etc.), while English uses the word almost always in the metaphorical sense. Related: Perceived; perceiving.
percent: 1560s, per cent, from Modern Latin per centum "by the hundred" (see per and hundred). Until early 20c. often treated as an abbreviation and punctuated accordingly.
percentage (n.): 1789, from percent + -age. Sense of "profit, advantage" is from 1862.
percentile (n.): 1885, coined by English scientist Francis Galton (1822-1911) from percent + -ile.
percept (n.): 1837, from Latin perceptum "(a thing) perceived," noun use of neuter past participle of percipere (see perceive). Formed on model of concept.
perceptible (adj.): early 15c., "perceptive," from Late Latin perceptibilis "perceptible," from Latin percept-, past participle stem of percipere (see perceive). Meaning "capable of being perceived" is from c. 1600. Related: Perceptibly; perceptibility.
perception (n.): late 14c., "receiving, collection," from Latin perceptionem (nominative perceptio) "perception, apprehension, a taking," from percipere "perceive" (see perceive). First used in the more literal sense of the Latin word; in secondary sense, "the taking cognizance of," it is recorded in English from 1610s. Meaning "intuitive or direct recognition of some innate quality" is from 1827.
perceptive (adj.): 1650s, from Latin percept-, past participle stem of percipere (see perceive) + -ive. In reference to intelligence from 1860. From mid-15c. as the name of a type of optical instrument. Related: Perceptively; perceptiveness.