1834, "conventional thing or practice;" 1842, "conventional quality or state;" see conventional + -ity. Related: Conventionalities.
"the operation or practice of fixing colors in solution in textiles, hides, hair, etc.," late 14c., verbal noun from dye (v.).
"art or practice of athletic games or exercises," c. 1730, from athletic; also see -ics. Probably formed on the model of gymnastics.
"art or practice of riding on a bicycle," 1869, verbal noun from bicycle (v.), for which see bicycle (n.).
"the practice, system, doctrines, etc. of authoritarians," 1883; see authoritarian + -ism. Early use was mostly in communist jargon.
"effect, operation, practice," early 15c., from Old French uevre (13c., Modern French oeuvre), from Latin opera (see opera).