Certainty vs Is that a fact

When to use each in English, with meaning, register, and examples.

Certainty

Top 1,000 (very common)B2noun

Is that a fact

Top 2,000 (common)
Most common: Certainty
 CertaintyIs that a fact
Pronunciation🇬🇧 /["/ˈsɜːtnti/"]/🇺🇸 /["/ˈsɜːrtnti/"]/🇬🇧 //ɪz ðæt ə fækt//🇺🇸 //ɪz ðæt ə fækt//
MeaningBeing sure about something.A statement that is true or can be proven.
ExampleThere is no certainty that the president's removal would end the civil war.Is that a fact, or just a rumor?
RegisterNeutralNeutral
How commonTop 1,000 (very common)Top 2,000 (common)
CEFR levelB2-
Part of speechnoun
Collocationsabsolute, complete, near, degree, with certainty, a lack of certainty, the one certainty, the only certainty, absolute, complete, near, degree, with certainty, a lack of certainty, the one certainty, the only certaintystate a fact, confirm a fact, discover a fact, accept a fact, challenge a fact
Antonymsdoubt, uncertainty-
Common mistakesConfused with 'certainty' vs 'certainly', Using 'certainty' with a verb instead of as a noun, Believing it can be used in place of 'sure' in informal contextsUsed in questions without evidence, confusing facts with opinions., Using it in informal settings where it's too serious., Confused with 'Is that true?', which may imply disbelief.
Usage notesUsed in both written and spoken contexts. More formal than 'sure'. Appropriate in academic or serious discussions, but can also be used casually to emphasize confidence.Used to confirm the truth of something. Appropriate in discussions or debates. Avoid in casual or sarcastic contexts.

See it in real clips

Certainty
Is that a fact

Frequently asked questions: Certainty vs Is that a fact

What's the difference between Certainty and Is that a fact?

Certainty: Being sure about something. Is that a fact: A statement that is true or can be proven.

Which is more common: Certainty and Is that a fact?

Certainty is the most common in everyday English.

Can you show an example of each?

Certainty: There is no certainty that the president's removal would end the civil war. Is that a fact: Is that a fact, or just a rumor?

Can I use Certainty and Is that a fact interchangeably?

Not always. Certainty and Is that a fact are related and overlap in some contexts, but they differ in register, how common they are, and usage, so swapping one for another can change the meaning or tone. Check the differences above before substituting.

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