Inception refers to the origin of an idea, to when and how something was started:
- Even before the inception of Christianity, the Romans held celebrations on 25 December.
- Since its inception, our company has opened stores in five continents.
Beginning, on the other hand, refers simply to the point in time when something started:
- We arrived late, so we missed the beginning of the film.
- At the beginning of every lesson, you should tell the students what they are about to learn.
The expression in the beginning refers to the “early days” of something:
- In the beginning, I didn’t enjoy my job, but now I just love it.
- “In the beginning, there was nothing. And God said, “Let there be light.” And there was light. There was still nothing, but you could see it a lot better.” – Woody Allen
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