The phrase "a conventional notion" is correct and usable in written English.
It can be used when referring to an idea or belief that is widely accepted or traditional within a particular context or society.
Example: "The belief that hard work leads to success is a conventional notion that many people hold."
Alternatives: "a traditional idea" or "a widely accepted belief".
In his teens, he relinquished their beliefs, and in later years enjoyed standing a conventional notion on its head by maintaining that, for many, religion was a substitute for art.
In this inventive and revealing work, Steven Ridgely examines Terayama's life and art to show that a conventional notion of him does not do full justice to the meaning and importance of his wide-ranging, often playful body of work.
However, the mistaken apprehension of a self in a stream of causally interconnected cognitive events does not preclude endorsing a conventional notion of self for ordinary individuals who lack a proper understanding of actions and their consequences.
But the Half King, named for an 18th-century American Indian leader, is unlike any conventional notion of a writers' bar.
Many virus groups simply share no common genes, effectively, ruling out any conventional notion of common origin.
Millennials have a very conventional notion of the American dream — a spouse, a house, a kid — but it is not going to be easy for them to get those things".
The trailers forced fidelity to a single woman and exposed him to a more conventional notion of family.
A highly conventional notion of maleness defines Shellac.
These organizations are– and I should stress this as well– from a very conventional notion of business success.
In the massive trilogy for solo cello subtitled The Three Ages of Man, Scelsi focuses even more closely on the minutiae of sound, the inner details of a single pitch or timbre, often in a way that suspends all conventional notions of musical time.
The collection seems to evidence your departure from a smaller, more conventional notion of the "self" to a more dynamic and inter-connected one.
