The phrase "is common usage" is correct and can be used in written English
It is often used to refer to something that is commonly used or accepted in a language or culture. Example: "Using slang words is common usage among teenagers, but may not be appropriate in a formal setting."
Not long ago, a writer objected to this, on the ground that "alternate reality" is common usage, and I caved.
Inside Edition: "There's a report that you used the N-word to refer to Obama, is that true?" Jackson: "Not to my knowledge - unfortunate that is common usage in private, but I'm not aware of that".
Consequently, if the hypothesis of exclusively clonal propagation is accepted under a special assumption on A r (A r = 0 say, as is common usage) and if consideration of additional genetic traits reveals genetic variation within the supposed clone, then a Type one error is detected that is likely to be due to an inappropriate specification of A r.
A call to Richard A. Baker, historian of the Senate, elicited this response: "I don't think that's common usage applied to a filibuster.
The "Chaim" reference may or not be Lorre's Hebrew name, perhaps used at his Bar Mitzvah (mine was Matis Yaho -- have no idea if I've spelled it right), but as it's doubtful it was used in a playful manner, as if, let's say, it was common usage to do so on the set, it was shameful and should be condemned by one and all.
Search engines, car engines, or engines of innovation are common usages--all complicated and powerful things.
Disruptive patterning is common in military usage, both for uniforms and for military vehicles.
However, both prescription-based data and general practitioner databases may underestimate the use of NSAIDs as unreported OTC usage is common.
While differential first exon usage is common to the mammalian GATA genes, their functional significance is less clear.
CAM usage is common among patients with diabetes mellitus (DM).
Strictly speaking, principal components analysis does not extract "factors," but the usage is common and we adopted it here.
