Definitions:

1. Denoting the end of a series or list. NOUN
   • Let's start from A and work our way to Z to ensure we cover everything in the presentation.
2. the 26th letter of the Roman alphabet noun
   • The British call 'Z' zed, and the Scots call it ezed, but Americans call it zee.
3. Used in repeated form to represent the sound of buzzing or snoring. NOUN
   • I'm being overcome with wearing as I write....zzzz,zzzz.