The phrase "at a frequent of" is not correct and usable in written English.
It seems to be an incomplete expression and does not convey a clear meaning.
Example: "We meet at a frequent of every Tuesday." (This is incorrect; it should be rephrased for clarity.)
Alternatives: "at a frequent rate of" or "with a frequency of".
President Donald Trump resisted the temptation on Thursday to take a shot at a frequent target of his barbs, Amazon CEO Jeff Bezos.
On Saturday, Obama opened with a jab at Trump, a frequent critic of the president's, saying "last year at this time, this very weekend, we finally delivered justice to one of the world's most notorious individuals".
These data suggest that neuronal HSV release occurs at a frequent slow trickle across wide regions of the genital tract.
Diane Ravitch, a professor of education at New York University, is a frequent critic of progressive educational fads, but she has a strongly positive view of language revival.
"People think that there is an illicit market and a legitimate market," said Ricardo J. Elia, associate professor of archaeology at Boston University and a frequent critic of the antiquities industry.
Marion Nestle, a professor of nutrition at New York University and a frequent critic of fast-food chains, said the green buildings were laudable but were ultimately intended to make people feel better about eating unhealthful food.
"They retain ownership, and if the trusts are run by professional managers, they will generate even more cash," said Ching-hsi Chang, a professor of economics at National Taiwan University and a frequent critic of the party.
Aaron Pallas, a professor of education at Teachers College of Columbia University and a frequent critic of the accountability system, said that while Mr. Polakow-Suransky's tenure as a teacher and a principal lend him credibility, his years as part of Mr. Klein's inner circle "will leave other people skeptical that he can show independence".
Dr. A. Eden Evins, an associate professor of psychiatry at Harvard Medical School, is a frequent critic of efforts to legalize marijuana.
"Wal-Mart isn't a white knight," said Nelson Lichtenstein, a professor of history at UC Santa Barbara and a frequent critic of Wal-Mart.
