from A to B Definition

A¹
a
noun As, A's, a's

1. The first letter of the English alphabet.
2a. music.
The sixth note on the scale of C major;
Form: A
2b. music.
The musical key which has this note as its base.
Form: A
3. Someone or something of first class, first in a sequence, or belonging to a class arbitrarily designated A.

Form: A (usually)
4. medicine.
One of the four blood types in the ABO blood group system.
5. The principal series of paper sizes, ranging from A0 (841 x 1189mm) to A10 (26 x 37mm).

Idiom: from A to B

From one place or point to another.

Idiom: from A to Z

From beginning to end.