The phrase "a viable definition" is correct and usable in written English.
You can use it when discussing a definition that is practical, feasible, or acceptable in a particular context.
Example: "In our discussion, we need to establish a viable definition of sustainability that can be applied across various industries."
Alternatives: "a workable definition" or "an acceptable definition".
The OIC is also one of the big reasons the UN has not been able to come up with a viable definition of terrorism.
He knows better than other mathematicians of his time how to treat quantifiers in his mathematical work (he was, for example, the first to give a viable definition of continutity, and to formulate the Bolzano-Cauchy criterion for the convergence of infinite series) but he gives no theoretical treatment of quantifiers in his logic.
Control over their structural and, hence, spectral properties can be attained by using electron beam lithography, which is not a viable solution for the definition of patterns over large areas.
"What is their definition of a viable community?
The technical approach to address this issue is summarized into the well-known tissue engineering paradigm [ 3], and one of its key points specifically focuses on the definition of a viable and instructive scaffold for cell seeding, proliferation, migration, and differentiation in the case of stem cells.
Definitely a viable tactic".
And almost by definition, a tiny home isn't a viable option for a family with children.
To build a viable biotech cluster, some areas have expanded the traditional definition of the industry beyond genetics to biofuels, agriculture, medical devices — even bioterrorism research.
These results suggest the SBPVP is a viable tool to quantify groundwater-surface water interactions in high definition in sandy streambeds.
She also expressed fears that the court had so broadened the definition of predisposition as to make it a viable defense in almost any case.
He fits Thomas Friedman's definition for what Americans Elect is all about -- launching the candidacy of a "viable centrist" who can be the Great Deficit Cutter and, by extension, the friendly face of entitlement program destruction.
