Etymology
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apperception (n.)

1753, "self-consciousness," from French aperception (17c.), from Latin apperceptionem, from ad "to" (see ad-) + perceptionem (nominative perceptio) "perception, apprehension, a taking," noun of action from past-participle stem of percipere "to perceive" (see perceive).

The meaning "act of the mind by which it becomes conscious of its ideas as its own (1876) is from German Apperzeption, coined by mathematician and philosopher Gottfried Wilhelm Leibniz (1646-1716) as noun corresponding to French apercevoir "perceive, notice, become aware of" on analogy of Perzeption/percevoir.

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psychedelic (adj.)

occasionally psychodelic, "producing expanded consciousness through heightened awareness and feeling," 1956, of drugs, suggested by British-born Canadian psychiatrist Humphry Osmond in a letter to Aldous Huxley and used by Osmond in a scientific paper published the next year; from Greek psykhē "mind" (see psyche) + dēloun "make visible, reveal" (from dēlos "visible, clear," from PIE root *dyeu- "to shine").

In popular use from 1965 with reference to anything producing effects or sensations similar to the common perception of the effects of a psychedelic drug. As a noun, "a psychedelic drug," from 1956.

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revive (v.)

early 15c., reviven, "regain consciousness; recover health," also transitive, "restore (someone) to health, revive (someone or something)," from Old French revivre (10c.) and directly from Latin revivere "to live again," from re- "again" (see re-) + vivere "to live" (from PIE root *gwei- "to live").

The meaning "bring back to use or notice" is from mid-15c.; as "put an old play on stage again after a lapse of time" by 1823. The intransitive sense of "return to a flourishing state" is by 1560s. Of feelings, activities, "begin to occur again" (intransitive), mid-15c. Related: Revived; reviving.

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stream (n.)

Old English stream "a course of water," from Proto-Germanic *strauma- (source also of Old Saxon strom, Old Norse straumr, Danish strøm, Swedish ström, Norwegian straum, Old Frisian stram, Dutch stroom, Old High German stroum, German Strom "current, river"), from PIE root *sreu- "to flow."

From early 12c. as "anything issuing from a source and flowing continuously." Meaning "current in the sea" (as in Gulf Stream) is recorded from late 14c., as is the sense of "steady current in a river." Stream of consciousness in lit crit first recorded 1930, originally in psychology (1855). Stream of thought is from 1890.

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sensibility (n.)

late 14c., "capability of being perceived by the physical senses;" also "ability to sense or perceive" (pain, etc.), from Old French sensibilite (14c.), from Late Latin sensibilitatem (nominative sensibilitas), from sensibilis "having feeling: perceptible by the senses," from sensus, past participle of sentire "perceive, feel" (see sense (n.)).

From early 15c. as "understanding, perception." A rare word in the record of English until the emergence 18c. of the meaning "emotional consciousness" (1751), especially "capacity for higher feelings or refined emotion." In English by early 20c. this refinement was felt to have reached such degree of excellence as required a French form, sensibilité. Related: Sensibilities.

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revert (v.)

c. 1300, reverten, "to come to oneself again, regain consciousness, recover from illness" (senses now obsolete), from Anglo-French reverter, Old French revertir "return, change back," from Vulgar Latin *revertire, variant of Latin revertere "turn back, turn about; come back, return," from re- "back" (see re-) + vertere "to turn" (from PIE root *wer- (2) "to turn, bend").

Meaning "return to a former state or position" is from mid-15c. Of property, "revert to a grantor or his successor," from mid-15c.; in reference to a return to a former habit, practice, custom, etc., from 1610s. In biology, "go back to an earlier, primitive, or ancestral type," 1859. Related: Reverted; reverting.

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periplum 

1934, in Ezra Pound: "periplum, not as land looks on a map / but as sea board seen by men sailing" [Canto LIX], or as Hugh Kenner described it, "The image of successive discoveries breaking upon the consciousness of the voyager ..., the voyage of discovery among facts, ... contrasted with the conventions and artificialities of the bird's-eye view afforded by the map," from accusative of Latin periplus, in classical use "a written list of the ports and coastal landmarks, in order, with approximate distances between, that a ship's captain could use to navigate a shore."

From Greek periplous, contracted from periploos, literally "a sailing round," from peri (prep.) "around, about, beyond" (from PIE root *per- (1) "forward") + ploos "a sailing, voyage, navigation," from plein "to navigate" (from PIE root *pleu- "to flow"). 

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remembrance (n.)

c. 1300, remembraunce, "a memory, recollection," from Old French remembrance (11c.), from remembrer (see remember). From late 14c. as "consideration, reflection; present consciousness of a past event; store of personal experiences available to recollection, capacity to recall the past." Also late 14c. as "memento, keepsake, souvenir," and "a commemoration, remembering, ritual of commemoration." Meaning "faculty of memory, capability of remembering" is from early 15c.

British Remembrance Day, the Sunday nearest Nov. 11 (originally in memory of the dead of World War I) is attested from 1921. A remembrancer (early 15c.) was a royal official of the Exchequer tasked with recording and collecting debts due to the Crown; hence also, figuratively "Death" (late 15c.).

To us old lads some thoughts come home
Who roamed a world young lads no more shall roam.
[Melville, from "To Ned"]
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elegant (adj.)

late 15c., "tastefully ornate," from Old French élégant (15c.) and directly from Latin elegantem (nominative elegans) "choice, fine, tasteful," collateral form of present participle of eligere "select with care, choose" (see election). Meaning "characterized by refined grace" is from 1520s. Latin elegans originally was a term of reproach, "dainty, fastidious;" the notion of "tastefully refined" emerged in classical Latin. Related: Elegantly.

Elegant implies that anything of an artificial character to which it is applied is the result of training and cultivation through the study of models or ideals of grace; graceful implies less of consciousness, and suggests often a natural gift. A rustic, uneducated girl may be naturally graceful, but not elegant. [Century Dictionary]
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syncope (n.)

1520s, "contraction of a word by omission of middle sounds or letters," from Latin syncope "contraction of a word by elision," from Greek synkope "contraction of a word," originally "a cutting off, cutting up, cutting short," from synkoptein "to cut up," from syn- "together, thoroughly" (see syn-) + koptein "to cut," which is perhaps from PIE root *kop- "to beat, strike, smite" (see hatchet (n.)).

An earlier use of the word in pathology is represented by Middle English syncopis, sincopin "loss of consciousness accompanied by weak pulse" (c. 1400, from Late Latin accusative syncopen); compare Old French syncope "illness, fainting fit" ("failure of the heart's action," hence "unconsciousness"). The spelling of this was re-Latinized 16c. Related: Syncopic; syncoptic.

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