The phrase "enlarge the definition" is correct and usable in written English.
You can use it when you want to expand on an existing definition. For example, "This definition of marketing does not take into account modern marketing techniques, so let's enlarge the definition to include digital and social media."
"But if this be true, it has more important bearings than simply to enlarge the definition of the word promise.
Today at Apple we still fight for this, and advocate for human rights, and we believe that every generation has a responsibility to enlarge the definition, not move inward.
More recently however, there have been attempts to enlarge the definition to include parameters of "decent life", rather than mere survival, such as the capacity to support families, maintain self-respect and be free to participate in the civic life of the country concerned (Glickman 1999; Brenner 2002).
Therefore it will be essential to use the new system with prudence in order to not to enlarge the definition of pathology to such an extent that is neither acceptable for society in general, nor helpful for clinical diagnosis -especially for those who are at the edge between personality pathology and an extreme personal style that should be accepted as part of human nature.
The Bush administration enlarged the definition of fill material to include contaminated mining waste, in clear violation of the law's intent.
To Vladimir Putin, the country is full of fascists — but he has enlarged the definition to include anyone who resists partitioning the country.
In modem times the judges enlarged the definition a little by holding that, if the wrong-doer gets possession by a trick or device, the crime is committed.
Rarely, in the thirteen months since Donald Trump entered the race for President, has it been clearer that he has refashioned the Republican Party in his own image and enlarged the definition of America's enemies.
Subsequent events have tended, in loose usage, to enlarge the number of lands included in the definition.
Then, Roldán-López-de-Hierro et al. slightly modified the previous definition in order to highlight this difference and to enlarge the family of all simulation functions.
You can enlarge the font.
