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practice [practice 词源字典]: practice: [15] The ultimate source of practice is Greek prássein ‘do, practise’. From its base *prak- were derived the noun praxis ‘doing, action’ (source of English praxis [16]) and the adjective praktós ‘to be done’. On this was based praktikós ‘concerned with action, practical’. This passed into English via late Latin practicus as practice [14], which was later superseded by practical [17].

From practicus was derived the medieval Latin verb practicāre, later practizāre. This passed into English via Old French practiser as practise [15]. The derived noun practise was altered to practice in the 16th century, on the analogy of pairs like advice/advise.
=> practical, practise, pragmatic, praxis[practice etymology, practice origin, 英语词源]
chiropractic: coined in American English, 1898 (adj.); 1899 (n.), from chiro- "hand" + praktikos "practical" (see practical), the whole of it loosely meant as "done by hand."
impracticable (adj.): "incapable of being done," 1670s, from assimilated form of in- (1) "not, opposite of" + practicable. Earlier in a sense of "impassable" (1650s).
impractical (adj.): 1823, from assimilated form of in- (1) "not, opposite of" + practical. Impracticable in the same sense dates from 1670s.
malpractice (n.): 1670s, hybrid coined from mal- + practice (n.). Also used in law for "illegal action by which a person seeks a benefit for himself while in a position of trust" (1758).
practic (n.): late 14c., "a way of doing something, method; practice, custom, usage;" also "an applied science;" from Old French practique "practice, usage" (13c.) and directly from Medieval Latin practica "practice, practical knowledge," ultimately from Greek praktike "practical" (as opposed to "theoretical;" see practical). From early 15c. as "practical aspect or application of something; practice as opposed to theory;" also, "knowledge of the practical aspect of something, practical experience."
practicable (adj.): 1670s, from Middle French pratiquable (1590s), from pratiquer "to practice," from Medieval Latin practicare "to practice" (see practical). Related: practicableness (1640s).
practical (adj.): early 15c., practicale "of or pertaining to matters of practice; applied," with -al (1) + earlier practic (adj.) "dealing with practical matters, applied, not merely theoretical" (early 15c.), or practic (n.) "method, practice, use" (late 14c.). In some cases directly from Old French practique (adj.) "fit for action," earlier pratique (13c.) and Medieval Latin practicalis, from Late Latin practicus "practical, active," from Greek praktikos "fit for action, fit for business; business-like, practical; active, effective, vigorous," from praktos "done; to be done," verbal adjective of prassein, prattein "to do, act, effect, accomplish."
practicality (n.): 1809, from practical + -ity. Related: Practicalities.
practically (adv.): 1620s, "in a practical manner," from practical + -ly (2). Meaning "for practical purposes, as good as" is from 1748; loosened sense of "almost" is from 1869.
practice (v.): c. 1400, "to do, act;" early 15c., "to follow or employ; to carry on a profession," especially medicine, from Old French pratiser, practiser "to practice," alteration of practiquer, from Medieval Latin practicare "to do, perform, practice," from Late Latin practicus "practical," from Greek praktikos "practical" (see practical).

From early 15c. as "to perform repeatedly to acquire skill, to learn by repeated performance;" mid-15c. as "to perform, to work at, exercise." Related: Practiced; practicing.
practice (n.): early 15c., practise, "practical application," originally especially of medicine but also alchemy, education, etc.; from Old French pratiser, from Medieval Latin practicare (see practice (v.)). From early 15c. often assimilated in spelling to nouns in -ice. Also as practic, which survived in parallel into 19c.
practiced (adj.): "expert," 1560s, past participle adjective from practice (v.).
practicing (adj.): 1620s in reference to professions; from 1906 in reference to religions; present participle adjective from practice (v.).
practicum (n.): 1904, from Late Latin practicum, neuter of practicus (see practical). Compare German praktikum.
practise: chiefly British English spelling of practice.
practitioner (n.): 1540s, a hybrid formed from practitian "practitioner" (c. 1500, from French practicien, from Late Latin practicus "fit for action," see practice (v.)) on model of parishioner. Johnson has as a secondary sense "One who uses any sly or dangerous arts."
unpracticed (adj.): also unpractised, 1550s, "unexpert," of persons, from un- (1) "not" + past participle of practice (v.). From 1530s as "not done, untried."