1. [ noun ] any specific activity or pursuit

"they avoided all recreational activity"

Related terms: inactivity act occupation use work market game attempt training procedure education behavior aid practice diversion measurement protection support demand search preparation worship variation leadership operation role creation acting presentation control organization turn ceremony waste provision perturbation cinch support ceremony continuance writing concealment location enjoyment dismantling works grouping occupation liveliness burst last solo fun buzz bag release sin timekeeping puncture service energizing wrongdoing domesticity pleasure behavior precession representation sensory_activity space_walk
2. [ noun ] the state of being active
Synonyms: action activeness

"his sphere of activity" "he is out of action"

Related terms: inaction inaction inaction state operation behavior play agency swing overdrive eruption busyness act active active
3. [ noun ] (biology) an organic process that takes place in the body
Synonyms: bodily_function body_process bodily_process

"respiratory activity"

Related terms: organic_process reaction breath sexual_activity control crying consumption breathing discharge respiration healing lacrimation festering ablactation overactivity placentation expectoration perspiring anastalsis opsonisation respiration peristalsis phagocytosis lactation hypostasis diaphoresis sleeping pinocytosis psilosis tanning insemination
4. [ noun ] (chemistry) the capacity of a substance to take part in a chemical reaction

"catalytic activity"

Related terms: capability chemistry
5. [ noun ] a process existing in or produced by nature (rather than by the intent of human beings)
Synonyms: action natural_action natural_process

"the action of natural forces" "volcanic activity"

Related terms: process phase_change diffusion aeration chromatography transpiration flow washing distillation absorption sorption release fractionation centrifugation decay desorption flocculation ion_exchange dissolution stiffening soak capture temperature_change softening synergy feedback drift oscillation formation antiredeposition electrophoresis vitrification adiabatic_process organic_process opacification curdling nuclear_reaction geological_process rigidification source sink effervescence magnetization ionization leach induction demagnetization capture acidification convection survival condensation sericulture transduction filtration extraction ignition precession_of_the_equinoxes scattering pair_production fossilization stimulation extinction concretion establishment succession oxygenation saltation inactivation materialisation chemical_process hardening radiation absolute_zero
6. [ noun ] (physics) the spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay
Synonyms: radioactivity radiation
Related terms: inactivity radiation act emission practice variation corpuscular_radiation space_walk
7. [ noun ] the trait of being active; moving or acting rapidly and energetically
Synonyms: activeness

"the level of activity declines with age"

Related terms: inactiveness trait animation dynamism active active inactive
Similar spelling:   activist