A

A

A¹ [ā]

n.

1. a blood type: see ABO SYSTEM

☆ 2. Educ. a grade indicating excellence [an A in history]

3. Music

a) the sixth tone or note in the ascending scale of C major

b) a key, string, etc. producing this tone

c) the scale having this tone as the keynote

adj.

first-class; A 1: see A ONE

A²

abbrev.

1. Physics absolute

2. adenine

3. America(n)

4. ampere

5. analog

6. angstrom: also Å

7. anode

8. answer

9. April

10. Chem. Archaic argon

11. Baseball Basketball Hockey assist(s)

12. attendance

13. August