a

noun pl. A's (āz), a's

1. the first letter of the English alphabet: from the Greek alpha, a borrowing from the Phoenician
2. any of the speech sounds that this letter represents, as, in English, the vowel (a) of hat, (ä) of father, (ā) of bake, or (ô) of call
3. a type or impression for a or A
4. the first in a sequence or group
5. an object shaped like

adjective

1. of a or A
2. first in a sequence or group
3. shaped like

adjective, indefinite article

1. one; one sort of we planted a tree
2. each; any one [a gun is dangerous]: a connotes a thing not previously noted or recognized, in contrast with the, which connotes a thing previously noted or recognized

Etymology: form of an before consonants: see an, adj.

Etymology: < OE an, on, in, on, at

adjective

1. about
2. absent
3. Physics acceleration
4. active
5. adjective
6. adult
7. alto
8. anonymous
9. answer
10. are (unit of area)
11. atto-

noun

1. a blood type
2. ☆ Educ. a grade indicating excellence an A in history
3. Music
   1. the sixth tone or note in the ascending scale of C major
   2. a key, string, etc. producing this tone
   3. the scale having this tone as the keynote

adjective

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