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for certain
adverb
definitely or positively (`sure' is sometimes used informally for `surely')
-

the results are surely encouraging

-

she certainly is a hard worker

-

it's going to be a good day for sure

-

they are coming, for certain

-

they thought he had been killed sure enough

-

he'll win sure as shooting

-

they sure smell good

-

sure he'll come

Syn: ↑surely, ↑certainly, ↑sure, ↑for sure, ↑sure enough, ↑sure as shooting
Derived from adjective: ↑certain (for: ↑certainly), ↑sure (for: ↑surely)
Usage Domain: ↑colloquialism

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adverb
: assuredly : as a certainty

never knew for certain how it happened — Time

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for certain
Assuredly, certainly
• • •
Main Entry:certain

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without any doubt

I don't know for certain

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for certain
: without a doubt : definitely or certainly

No one knows for certain what the outcome will be.

We'll need more than an hour to get there for certain. [=for sure]

• • •
Main Entry:certain

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for ˈcertain idiom
without doubt

I can't say for certain when we'll arrive.

Main entry:certainidiom

Useful english dictionary. 2012.