Englishfor English speakers
assumption
Noun
—
An assumption is a guess or belief about something without having enough information to know if it is true. In maths or science: something assumed to be true in order to build an argument or calculation.
You shouldn't make the assumption that guns are only a problem in big cities.
To calculate the age of a rock we make the assumption that the rate of radioactive decay is constant.
of
Preposition
—
Made using.
It is a house of cards.
certainty
Noun
—
Certainty is the state of being 100% sure.
It's a little too early to say that with absolute certainty.
The doctor could not say what was wrong with any degree of certainty.
—
If something is a certainty, it is sure to happen.
The expected change became a certainty two weeks ago.
We need to accept the certainties of aging, illness, and death.