The phrase "at least approximately" is correct and can be used in written English.
It is used to indicate that something is not exact but close enough to be considered acceptable or accurate. Example: The scientist estimated that the volcano will erupt in at least approximately two weeks.
His personal checking account, reviewed by the FBI during its investigation into the two agents, showed incoming deposits of "at least approximately $757,000" between April 2013 and May 2014.
Many fractals possess the property of self-similarity, at least approximately, if not exactly.
Their adsorption behavior can be described at least approximately with the Langmuir equation.
Most of the company's restaurants are franchises, owned and operated by people who live at least approximately nearby to their customers.
"But the only way to understand at least approximately what is happening is to go and participate".
For advice to be relevant, the beginnings, aims, and conditions of those who are analyzed and those who receive the advice should match, at least approximately.
Some are based on the normal distribution, and the corresponding tests assume that the underlying population is at least approximately normally distributed.
In both cases, it is necessary to identify and compute, at least approximately, all the eigenvectors corresponding to the "bad" eigenvalues.
Polynomial regression models are often used in practice although practitioners are seldom sure whether their assumed linear regression model is at least approximately true.
But I think, he had it at least approximately right, that exchange has become a bigger and bigger part of our lives, and that's modern civilization.
The order of changes in the Chavin influences in the Ocucaje sequence can be expected to reflect at least approximately the order of changes in Chavin art.
