practic n.

early 15c., practicale "of or pertaining to matters of action, practice, or use; 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 (Attic prattein) "to do, act, effect, accomplish; come to an end, succeed," literally "to pass through, travel," from PIE *per(h)- "go through, cross," an enlargement of the root *per- (2) "to lead, pass over."

Of persons, in reference to skills or occupations, "whose knowledge is derived from practice rather than theory," 1660s. The noun meaning "examination or lesson devoted to practice in a subject" is by 1934. Practical joke "trick played on someone for the sake of annoying him and raising a laugh at his expense" is from 1771 on the notion of "a jest carried into action" (earlier handicraft joke, 1741).

early 15c., practise, "practical aspect or application," originally especially of medicine but also alchemy, education, etc.; from Old French pratiser, from Medieval Latin practicare (see practice (v.)). It largely displaced the older word, practic, which survived in parallel into 19c. From early 15c. it began to be assimilated in spelling to nouns in -ice.

Sense of "habit, frequent or customary performance" is from c. 1500. Meaning "exercise for instruction or discipline" is from 1520s. Sense of "action, the process of accomplishing or carrying out" (opposed to speculation or theory) is from 1530s. The meaning "regular pursuit of some employment or business" is from 1570s. In 16c.-17c. it also was used in an evil sense, "conspiracy, a scheme."

Practice is sometimes erroneously used for experience, which is a much broader word. Practice is the repetition of an act : as, to become a skilled marksman by practice. Experience is, by derivation, a going clear through, and may mean action, but much oftener views the person as acted upon, taught, disciplined, by what befalls him. [Century Dictionary]