"strive to define" is correct and usable in written English. It is a phrase that is used to emphasize working hard to accomplish something, usually to create clarity and understanding. For example, "We should strive to define our goals so that we can create a clear plan of action."
You want to always strive to define standards up.
As I strive to define my own family, I still can't figure out what I think the perfect family is".
When he announced his candidacy he looked to reassure Fifa colleagues: "I am one of you, and I know how hard you strive to define football".
Firstly, a high percentage of the films she worked on feature intelligent, self-assertive heroines who strive to define their roles in life.
So I close with a challenge: that we each strive to define what we can do to invent a better MIT community for those who are here today, and for those who will follow us tomorrow.
One reads it certainly for its politics, but even more for the depth and complexity of its characters who strive to define themselves in a world that still puts everything and everybody in one or another category of ideology and national aspiration.
Now he has many collaborators as he strives to define an ever-evolving community.
Throughout his rule, Mr. Hussein strove to define himself as heir to the greatest leaders and warriors of the region's past.
Over time I understood that what this really meant was that they were striving to define themselves as something other than the endless media presentations of "scroungers".
He continues striving to define the role of the 3D printer for the Togolese market and make plans to improve its functioning.
Like those great films, "Pan's Labyrinth" needs a child at its heart, because it is partly about a nation striving to define itself, and confronted by a confusion of paths.
Ludwig does not simply clarify my doubts with English writing, it enlightens my writing with new possibilities
Simone Ivan Conte
Software Engineer at Adobe, UK