a to z

Short definition from Wiktionary

Noun

1. 1
   Alternative letter-case form of A to Z.
2. 2
   Any of a set of street maps of most British towns and cities; properly the Geographer's A–Z Street Atlas.
3. 3
   All facts related to a subject
4. 4
   An encyclopedic or comprehensive guide.

Adverb

1. 1
   Alphabetical order; lexical order.
2. 2
   From beginning to the end.
3. 3
   Over the entirety; completely.