zero · number /ˈzɪə.rəʊ/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)

B1 the temperature at which water freezes in degrees centigrade
Dictionary example:

The temperature is expected to drop to ten degrees below zero tonight.

Learner example:

We have to learn that [it] is not natural for a lion [to live] in a country where, in winter, [the] temperature can fall below zero. (First Certificate in English; B2; Italian)

Cambridge University Press