Meaning of the word "at first" in English

What does "at first" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

at first

US /æt fɜrst/
UK /æt fɜːst/

Phrase

at the beginning; originally

Example:
At first, I didn't like the idea, but then I changed my mind.
The new system was difficult to use at first.