noun
or Z /ˈziː, Brit ˈzɛd/ , pl z's or zs or Z's or Zs /ˈziːz, Brit ˈzɛdz/
the 26th letter of the English alphabet [count]
Z's also Zs or z's [plural] US informal :sleep
[noncount] - used in the phrase x, y, and z to refer to the third thing in a group of three unnamed things
from A to Z