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expertise (n.)[expertise 词源字典]: "quality or state of being an expert," 1868, from French expertise (16c.) "expert appraisal, expert's report," from expert (see expert). Earlier and more English was expertness (c. 1600).[expertise etymology, expertise origin, 英语词源]
experto crede: Latin, "take it from one who knows" ("Aeneid," xi.283); dative singular of expertus (see expert (adj.)) + imperative singular of credere (see credo).
expiate (v.): c. 1600 (OED 2nd ed. print entry has a typographical error in the earliest date), from Latin expiatus, past participle of expiare "to make amends, atone for" (see expiation). Related: Expiable (1560s); expiated; expiating.
expiation (n.): early 15c., via Middle French expiation or directly from Latin expiationem (nominative expiatio) "satisfaction, atonement," noun of action from past participle stem of expiare "make amends for, atone for; purge by sacrifice, make good," from ex- "completely" (see ex-) + piare "propitiate, appease," from pius "faithful, loyal, devout" (see pious).
The sacrifice of expiation is that which tendeth to appease the wrath of God. [Thomas Norton, translation of Calvin's "Institutes of Christian Religion," 1561]
expiatory (adj.): 1540s, from Late Latin expiatorius, from expiat-, past participle stem of Latin expiare "make amends" (see expiation).
expiration (n.): early 15c., "vapor, breath," from Middle French expiration, from Latin expirationem/exspirationem (nominative expiratio/exspiratio) "a breathing out, exhalation," noun of action from past participle stem of expirare/exspirare "breathe out; breathe one's last" (see expire). Meaning "termination, end, close" is from 1560s.
expire (v.): c. 1400, "to die," from Old French expirer "expire, elapse" (12c.), from Latin expirare/exspirare "breathe out, blow out, exhale; breathe one's last, die," hence, figuratively, "expire, come to an end, cease," from ex- "out" (see ex-) + spirare "to breathe" (see spirit (n.)). "Die" is the older sense in English; that of "breathe out" is first attested 1580s. Of laws, patents, treaties, etc., mid-15c. In 17c. also transitive. Related: Expired; expiring.
expiry (n.): "close, termination," 1752, from expire + -y (4). Meaning "dying, death" is from 1790.
explain (v.): early 15c., from Latin explanare "to explain, make clear, make plain" (see explanation). Originally explane, spelling altered by influence of plain. Also see plane (v.2). In 17c., occasionally used more literally, of the unfolding of material things: Evelyn has buds that "explain into leaves" ["Sylva, or, A discourse of forest-trees, and the propagation of timber in His Majesties dominions," 1664]. Related: Explained; explaining; explains. To explain (something) away is from 1709.
explainable (adj.): c. 1600, from explain + -able.
explanation (n.): late 14c., from Latin explanationem (nominative explanatio) "an explanation, interpretation," noun of action from past participle stem of explanare "to make plain or clear, explain," literally "make level, flatten," from ex- "out" (see ex-) + planus "flat" (see plane (n.1)).
explanatory (adj.): 1610s, from or modeled on Late Latin explanatorius "having to do with an explanation," from Latin explanat-, past participle stem of explanare "make plain or clear" (see explanation).
expletive (n.): 1610s, "a word or phrase serving to fill out a sentence or metrical line," from Middle French explétif (15c.) and directly from Late Latin expletivus "serving to fill out," from explet-, past participle stem of Latin explere "fill out, fill up, glut," from ex- "out" (see ex-) + plere "to fill" (see pleio-).

Sense of "an exclamation," especially "a curse word, an oath," first recorded 1815 in Sir Walter Scott, popularized by edited transcripts of Watergate tapes (mid-1970s), in which expletive deleted replaced President Nixon's salty expressions. As an adjective, from 1660s.
expletive (adj.): mid-15c., in grammar, "correlative," from Latin expletivus "serving to fill out" (see expletive (n.)).
explicable (adj.): 1550s, from or modeled on Latin explicabilis "capable of being unraveled, that may be explained," from explicare "unfold; explain" (see explicit). Middle English had a verb expliken "explain, interpret" (mid-15c.).
explicate (v.): "give a detailed account of," 1530s, from Latin explicatus, past participle of explicare "unfold, unravel, explain" (see explicit). Related: Explicated; explicating.
explication (n.): 1520s, from Middle French explication, from Latin explicationem (nominative explicatio), noun of action from past participle stem of explicare "unfold; explain" (see explicit).
explicative (adj.): 1640s, "having the function of explaining," from Latin explicativus, from explicat-, past participle stem of explicare "unfold; explain" (see explicit). As a noun, from 1775.
explicit (adj.): 1610s, "open to the understanding, not obscure or ambiguous," from French explicite, from Latin explicitus "unobstructed," variant past participle of explicare "unfold, unravel, explain," from ex- "out" (see ex-) + plicare "to fold" (see ply (v.1)). As a euphemism for "pornographic" it dates from 1971. Related: Explicitness. "Explicitus" was written at the end of medieval books, originally short for explicitus est liber "the book is unrolled."
explicitly (adv.): 1630s, from explicit + -ly (2). Opposed to implicitly.