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Ascertain Meaning in English

word

ˌæsɝˈteɪn
as-er-TAYN
ˌæsətˈeɪn
as-uh-TAYN

Definition

To find out something with certainty, often by investigating or checking facts.

Usage & Nuances

Formal and common in academic, legal, and official contexts. Usually takes an object: 'ascertain the cause', 'ascertain whether', 'ascertain that'. Not used in casual speech; synonyms include 'find out' or 'confirm'.

Example Sentences

The police need to ascertain the facts before making a decision.

basic

Scientists try to ascertain the causes of diseases.

basic

Please ascertain if he is available for the meeting.

basic

I called the hotel to ascertain whether my reservation was confirmed.

natural

It took weeks to ascertain the truth behind the rumor.

natural

He's trying to ascertain what went wrong with the project.

natural