semi
auto
multi
anti
fore
100

Half of a circle

What is semicircle

100

A passenger vehicle with four wheels and a engine

What is Automobile

100

Involving more than one 

What is multiple

100

part of the arm between the elbow and the wrist

what is forearm

200

Occurring or done every half year(twice a year)

What is semiannual

200

A persons own signature

What is autograph

200

performing more than one task at a time

what is multitask

200

stopping the growth of bacteria

what is antibacterial

200

to predict or calculate in advance

what is forecast

300

Partially or half finished.

What is semifinished

300

Any organisms that produces its own food 

What is autotroph

300

having many colors

what is multicolored

300

a substance that destroys bacteria; is used to treat diseases

what is antibiotic

300

the first, or most important part or place

what is forefront

400

A punctuation mark that divides a sentence between two clauses

What is semicolon

400

To start ,operate,move, ect. independently

What is automatic

400

using several languages

what is multilingual

400

less powerful than expected 

what is anticlimactic

400

to go before

what is forego

500

Partially or somewhat public

What is semipublic

500

A history of a person's life written or told by that person

What is autobiography

500

relating to many cultures

what is multicultural

500

unwilling to associate in a friendly way

what is antisocial

500

to warn in advance

what is forewarn