The phrase "as defined by several" is correct and usable in written English.
It can be used when referencing definitions or explanations provided by multiple sources or authorities.
Example: "The term 'sustainability' is often understood as defined by several leading environmental organizations."
Alternatives: "as outlined by various" or "as described by multiple".
All the patients had first been diagnosed with low-risk prostate cancer (as defined by several measures, including a Gleason score of 6 or less).
Tools for assessing environmental impacts based on the volume of material needed as defined by several material properties and design parameters, such as required moment of inertia and cross-sectional area, are investigated.
Instead, the surgical procedure should be tailored to the exact localization of inguinal lymph nodes as defined by several anatomical studies [ 13- 15].
Since human ES cells are derived from pre-implantation human embryos, they are considered 'human beings' by the Catholic Church, and therefore have the same moral status of a 'person', as defined by several constitutions such as those of US and Italy (Avila, 2001; Mazzoni, 2002).
The primary cultures typically took several weeks to "mature" (as defined by growth in the culture vessel approaching 70 80% confluence).
criteria as defined by bank.
Secretory differentiation, which in some literature is referred to as lactogenesis stage I, is defined by several biochemical changes that reflect a change to a pre-lactational state.
As described earlier, traffic arrivals are defined by several time-varying profiles resolved to 15 min.
Costs might be defined by several variables, such as money, effort, and time spent commuting.
Actually, the m(A) can be defined by several methods such as the cumulative density function (CDF) and probability density function (PDF).
The final image is defined by several parameters that we get from the URL such as the stock symbol, periods of time, customized colors, gradient, and backgrounds.
