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apparatus (n.)[apparatus 词源字典]: 1620s, from Latin apparatus "tools, implements, equipment; preparation, a preparing," noun of state from past participle stem of apparare "prepare," from ad- "to" (see ad-) + parare "make ready" (see pare).[apparatus etymology, apparatus origin, 英语词源]
apparel (v.): mid-13c., "to equip (in any way)," from Old French apareillier (12c.), from Vulgar Latin *appariculare. This is either from Latin apparare "prepare, make ready" (see apparatus), or from Vulgar Latin *ad-particulare "to put things together." The meaning "to attire in proper clothing" is from mid-14c. Cognate with Italian aparecchiare, Spanish aparejar, Portuguese aparelhar. Related: Appareled; apparelled; appareling; apparelling.
apparel (n.): "personal outfit or attire," early 14c., also "ship's rigging," from Old French apareil "preparation," from apareillier (see apparel (v.)). Earlier in same sense was apparelment (early 14c.).
apparent (adj.): late 14c., from Old French aparant "evident, obvious, visible," from Latin apparentem (nominative apparens) "visible, manifest," present participle of apparere (see appear). First attested in phrase heir apparent (see heir). Meaning "superficial" is c. 1400. Apparent magnitude in astronomy (how bright a heavenly body looks from earth, as opposed to absolute magnitude, which is how bright it really is) is attested from 1875.
apparently (adv.): late 14c., "visibly, openly," from apparent + -ly (2). Meaning "evidently" is from 1550s; that of "to all appearances" (but not necessarily "really") is from 1560s; meaning "so far as can be judged, seemingly," is from 1846. A gradual retreat from certainty.
apparition (n.): c. 1500, "unclosing" (of Heaven), from Anglo-French aparicion, Old French apparition, aparoison (15c.), used in reference to the Epiphany (revealing of Christ child to the Wise Men), from Late Latin apparitionem (nominative apparitio) "an appearance," also "attendants," in classical Latin "service, servants," noun of action from past participle stem of apparere "appear" (see appear). Meaning "ghost" first recorded c. 1600; the shade of sense differentiation between appearance and apparition is that the latter tends to be unexpected or startling.
appeal (v.): early 14c., originally in legal sense of "to call" to a higher judge or court, from Anglo-French apeler "to call upon, accuse," Old French apeler "make an appeal" (11c., Modern French appeler), from Latin appellare "to accost, address, appeal to, summon, name," iterative of appellere "to prepare," from ad- "to" (see ad-) + pellere "to beat, drive" (see pulse (n.1)). Related: Appealed; appealing.

Probably a Roman metaphoric extension of a nautical term for "driving a ship toward a particular landing." Popular modern meaning "to be attractive or pleasing" is quite recent, attested from 1907 (appealing in this sense is from 1891), from the notion of "to address oneself in expectation of a sympathetic response."
appeal (n.): c. 1300, in the legal sense, from Old French apel (Modern French appel), back-formation from apeler (see appeal (v.)). Meaning "call to an authority" is from 1620s; that of "attractive power" attested by 1916.
appealing: mid-15c. as a noun, "action of petitioning a higher court or authority," verbal noun from appeal (v.). Adjectival sense of "attractive" attested by 1892. Related: Appealingly.
appear (v.): late 13c., "to come into view," from stem of Old French aparoir (12c., Modern French apparoir) "appear, come to light, come forth," from Latin apparere "to appear, come in sight, make an appearance," from ad- "to" (see ad-) + parere "to come forth, be visible." Of persons, "present oneself," late 14c. Meaning "seem, have a certain appearance" is late 14c. Related: Appeared; appearing.
appearance (n.): late 14c., "visible state or form, figure; mere show," from Anglo-French apparaunce, Old French aparance "appearance, display, pomp" (13c.), from Latin apparentia, abstract noun from aparentem, past participle of apparere (see appear). Meaning "semblance" is recorded from early 15c.; that of "action of coming into view" is mid-15c. Phrase keep up appearances attested from 1760 (save appearances in same sense is 1711).
appeasable (adj.): 1540s; see appease + -able. Related: Appeasably.
appease (v.): c. 1300 "to reconcile," from Anglo-French apeser, Old French apaisier "to pacify, make peace, appease, be reconciled, placate" (12c.), from the phrase a paisier "bring to peace," from a "to" (see ad-) + pais, from Latin pacem (nominative pax) "peace" (see peace). Related: Appeased; appeasing.
appeasement (n.): mid-15c., "pacification," from Middle French apeisement, Old French apaisement "appeasement, calming," noun of action from apaisier (see appease). First recorded 1919 in international political sense; not pejorative until failure of Chamberlain's policy toward Germany in 1939 (Methods of appeasement was Chamberlain's description of his policy).
appeaser (n.): mid-15c., agent noun from appease (v.). Political sense attested from 1940.
appellant (n.): late 14c., Anglo-French, from Old French apelant, noun use of present participle of apeler, from Latin appellare (see appeal).
appellate (adj.): "pertaining to appeals," 1726, from Latin appellatus, past participle of appellare (see appeal). Appellate jurisdiction is in Blackstone (1768).
appellation (n.): late 15c., "action of appealing" (to a higher authority), from Old French apelacion (13c.), from Latin appellationem (nominative appellatio) "an addressing, accosting; an appeal; a name, title," noun of action from past participle stem of appellare (see appeal). Meaning "designation, name given to a person, thing, or class" is from mid-15c., from a sense also found in Middle French appeler.
appellative (adj.): mid-15c., from Latin appellativus, from appellat-, past participle stem of appellare (see appeal). As a noun, attested from 1590s.
appellee (n.): 1530s, from Anglo-French (late 14c.), from Old French apelé (Modern French appelé) "accused, defendant," noun use of past participle of appeler "to call, address;" see appeal + -ee.