Ab-

1
Ab-

• away

2
A-

• without

3
Acro-

• high

4
Alti-

• high

5
Ambi-

• both

6
Anti-

• Against, opposite

7
abnormal

• Different from that which is considered normal

8
abstain

• To choose NOT to do something

9
abduct

• To kidnap

10
apathy

• Not caring about what is happening

11
atheist

• One who does not believe in the existence of God

12
anonymous

• Nameless

13
acronym

• A word made from the first letter of a phrase

14
acrobat

• One skilled in performing gymnastic feats

15
acropolis

• The high part of an ancient Greek city

16
altar

• A raised structure used for worship (in a church)

17
altitude

• The height of an object compared to a given level

18
ambidextrous

• Using both hands with equal ability

19
ambivalent

• Feeling both good and bad feelings toward
  something

20
antonym

• A word that is the opposite of another word

21
antibiotic

• To do with stopping the growth of bacteria