minusone

noun
UK /ˈmaɪnəs wʌn/
US /ˈmaɪnəs wʌn/

Minus one means one less than a number.

If you have three apples and eat one, you have minus one, which is two.


OTHER MEANINGS

2. The number that is one below zero.

On the number line, minus one comes just before zero.

3. A countdown call meaning one second remains.

The rocket launched after the call of minus one.

4. A score or value that is one point below a baseline.

The team finished at minus one in the goal difference.