at the beginning
Definitions
At the initial stage or starting point of a process, event, or period of time.
In the first position or at the start of something.
Examples
I felt nervous at the beginning of the presentation.
The story was quite confusing at the beginning, but it became clear later on.
Synonyms
initially at the outset in the first place to start with at the start firstly at the inception
Antonyms
finally at the end eventually in the conclusion at the finish lastly at the close