The phrase "and defined by a" is correct and usable in written English.
It can be used when describing something that is characterized or specified by a particular quality or feature.
Example: "The project is complex and defined by a series of intricate requirements that must be met."
Alternatives: "and characterized by a" or "and specified by a".
It is defined by an essential insecurity, tempered by doubt and defined by a radical experience of freedom.
Since then, American brandy has been dominated, and defined, by a few brands — Christian Brothers, E&J, Korbel — and their thick, super-sweet style.
Power devolved from a single leader to a broader church government and such groups ceased to be seen as simply personality-driven and defined by a single individual.
Where the resistance faced by the group during the 1940s was wide-ranging and defined by a number of conflicting interests, here their sole detractor is a stuffy Columbia professor with an unshakeable hard-on for metre and form.
They are pitiless and isolated, often situated in places that might be beautiful were they not so extreme, and defined by a kind of human deprivation particular to the industry.
It's a big, open-plan space, rich with texture (walnut veneers, grasscloth wallpaper) and defined by a sunken living room whose white carpet suggests an impractical streak that spells trouble for the Drapers' marriage.
They were what the locals call "island dogs," a mix of various breeds, and defined by an uncanny ability to suddenly materialize whenever food is unwrapped.
Genetically driven to grow and defined by an ethos insiders call "long-term greedy," this firm wants more.
PNS is uncommon and defined by an acute or sub-acute neurological syndrome associated with a cancer.
software and defined by an average value of three measurements across the surface epithelium.
Persistence was evaluated at 6-month periods (fixed for all the patients) and defined by an independent observer according to the information recorded in standardized formats.
