Meaning of the word "for certain" in English

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

for certain

US /fɔr ˈsɜrtən/
UK /fɔː ˈsɜːtn/

Phrase

without doubt; definitely

Example:
I know for certain that he was at the party.
Can you tell me for certain when the meeting will start?