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entity go
that which is perceived or known or inferred to have its own distinct existence (living or nonliving)

abstraction, abstract entity go
a general concept formed by extracting common features from specific examples

psychological feature go
a feature of the mental life of a living organism

event go
something that happens at a given place and time

act, deed, human action, human activity go
something that people do or cause to happen

activity go
any specific behavior

effort, attempt, endeavor, endeavour, try go
earnest and conscientious activity intended to do or accomplish something

run, test, trial go
the act of testing something

clinical trial, clinical test
a rigorously controlled test of a new drug or a new invasive medical device on human subjects

noun.act

4 Subcategories

phase I clinical trial, phase I go
a clinical trial on a few persons to determine the safety of a new drug or invasive medical device
phase II clinical trial, phase II go
a clinical trial on more persons than in phase I
phase III clinical trial, phase III go
a large clinical trial of a treatment or drug that in phase I and phase II has been shown to be efficacious with tolerable side effects
phase IV clinical trial, phase IV go
sometimes the FDA approves a drug for general use but requires the manufacturer to continue to monitor its effects