zero · number /ˈzɪr.oʊ/Full view
zero (NUMBER)
A2 C or U the number 0
Dictionary example:

Five, four, three, two, one, zero.

Learner example:

Can you [bring] me my laptop, because I have to do [some] homework on it - if I don't do this I will [get] a zero. (Key English Test; A2; Portuguese)

zero (TEMPERATURE)
B1 the temperature that is 32 degrees lower than the temperature at which water freezes in degrees Fahrenheit, or the temperature at which water freezes in degrees centigrade
Dictionary example:

In the winter, the temperature can drop to 15 degrees below zero.

Cambridge University Press