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The phrase "activity is defined by" is correct and usable in written English.
It can be used when explaining the characteristics or parameters that determine what constitutes a specific activity.
Example: "In this study, the activity is defined by the frequency and duration of physical exercise performed by participants."
Alternatives: "activity is characterized by" or "activity is determined by".
Exact(16)
That strongly suggests that activity is defined by a good contact between Cu0 and ZnO, whereas the selectivity depends on the morphology of copper nanoparticles.
If something is going on, then some action seems to be required somewhere; and in the nature of things, the domain of activity is defined by the classification of goings on.
In this discussion, human economic activity is defined by the regenerative power of the ecosystem (e.g., the ability of the forest to regenerate once timber has been cut) and absorbency (e.g., the ability of the atmosphere and ocean to take in and cleanse pollutants).
Each state variable σi can take a discrete number of states which denote the level of activity of the signaling element represented by node i, and where each level of activity is defined by its regulatory effect on the state variables of its target nodes.
The covariance function of the atrial activity is defined by: ρ s A = E s A ( t + τ ) s A ( t ) ≃ ρ s A ( τ + n P ) (3). corresponding to one entry in the diagonal of the covariance matrix of the source signals R s = E [s(t + τ)s(t)T].
One unit of activity is defined by the production of 1 µmol of NADH or NADPH per minute at 40°C.
Similar(44)
According to these thresholds, 'epidemic influenza activity' was defined by rates at or above 35 cases per 1000 consultations.[12] We restricted our analysis to patients who presented for medical attention at any of the sentinel surveillance sites and who subsequently had a swab taken for the identification of influenza virus by RT-PCR.
Disease activity was defined by the SLE Disease Activity Index (SLEDAI).
Physical activity was defined by the seven-day physical activity recall questionnaire [ 52].
These categories of physical activity were defined by the SFSO as described elsewhere [ 24].
The beginning of ventricular electrical activity was defined by the beginning of the QRS complex.
More suggestions(16)
activity is examined by
activity is described by
interest is defined by
activity is confined by
activity is characterised by
organization is defined by
business is defined by
support is defined by
service is defined by
campaign is defined by
activity is decided by
activity is influenced by
activity is manipulated by
activity is controlled by
activity is inhibited by
activity is triggered by
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com