Assertion and Assumption

Assertion

Assertion noun - An idea or opinion that is put forth in a discussion or debate.
Usage example: made the unlikely assertion that gravity affects light

Assumption and assertion are semantically related in proposition topic. In some cases you can use "Assumption" instead a noun "Assertion".

Assumption

Assumption noun - Something taken as being true or factual and used as a starting point for a course of action or reasoning.
Usage example: your argument is faulty because it's based on erroneous assumptions

Assertion and assumption are semantically related in proposition topic. Sometimes you can use "Assertion" instead a noun "Assumption".

Nearby Words: assume, assumed, assumptive

How words are described

common common assertion common assumption
certain certain assertion certain assumption
original original assertion original assumption
initial initial assertion initial assumption
Other adjectives: popular, logical, wrong, unfortunate, false, implicit, odd, last, opposite.
Cite this Source
Assumption and Assertion. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/assertion/assumption
Assertion & Assumption. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/assertion/assumption>.
Assumption or Assertion. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/assertion/assumption.
Google Ngram Viewer shows how "assertion" and "assumption" have occurred on timeline