The phrase "a definite beginning" is correct and usable in written English.
It can be used when referring to a clear or specific starting point in a process, story, or event.
Example: "The project had a definite beginning, marked by the initial meeting where all team members gathered to discuss their roles."
Alternatives: "a clear starting point" or "a specific onset".
"[The Civil War] had a definite beginning, a relatively short middle--four years--and an absolute end.
After all, the football season had a definite beginning and an end, and there was always cricket and tennis to look forward to in the summer.
That depends on if the album is seen as a time capsule chronicling a creative period with a definite beginning and end, or as something that can continue to evolve, which is only completed when the artist has had enough of upgrading it.
Seizures appear in EEG as sudden, repetitive, evolving, stereotyped waveforms that last at least 10 s and have a definite beginning, middle, and end[13].
You can do the administrative and management jobs that the scientists you work with see as tedious and time-consuming, but that for me represent tasks with a definite beginning, middle, and end.
Larkin stepped away from his background as a jazz composer and musician to create music with less structure and without a definite beginning and end.
Because right from the very beginning (to be specific: April of 2010), back when Alex first pitched Disney Channel executives on his idea for an animated series that would somehow blend the comic stylings of The Simpsons with the on-going / over-arching mythology of The X-Files, Hirsch envisioned this show as having a very definite beginning, middle and end.
They described a negative spiral with no definite beginning or end, growing insidiously and gaining downward momentum.
Thus the prediction from the combined models successfully explains the data, which suggests that we can identify the swarm period as a period of completely different characteristics with definite beginning and end times.
The steady-state theory, in protest claims that the universe is eternal & constant, & therefore has no definite beginning.
There is no definite beginning or end to each of these phases; rather they merge into one another, as not all societies moved forward at the same time.
