re-

reorder

rewrite

re- again

reorder- to put in order again

rewrite- to write something again

un-

unpleasant

unrealistic

un- not

unpleasant- not pleasing

unrealistic- not real, not believable, not likely to happen

im- used before words that start with the letters: b, m, or p; has two meanings

important

immediate

OR

immortal

impractical

im- in, within, into, toward

important- toward the top of list, meaningful 

immediate- closest in importance

im- not, non

immortal- not able to die, live forever

impractical-  not practical (useful)

in-- used before words that start with letters other than l, b, m, p, r; has two meanings

inconclusive

inaccurate

OR

innate

incoming

in- not, non

in- in, within, into, toward

inconclusive-not able to make a conclusion about

inaccurate- not accurate, not correct

OR

innate- a quality within one when born

incoming- moving toward something

il- used before words that start with an "l", has two meanings

illiterate

illegible

OR

illuminate

illustrate

il- not, non

illiterate- not able to read/write

illegible- not readable, not neat enough to be read

il- in, within, into, toward

illuminate-to put light into

illustrate- to put "luster" or design into

dis-

disrespect

disagree

dis- do the opposite of, deprive of, exclude or expel from

disrespect- deprive of respect (show manners)

disagree- opposite of agree with

non-

nontoxic

nonprofit 

non - a simple negative force as implying mere negation or absence of something

nontoxic- not toxic or poisonous

nonprofit - not making money, or primarily focused on making money 

mis-

mischarge

mistaken

 mis-wrong or incorrect 

mischarge- to charge wrongly 

mistaken- someone or something that is wrong

Uni-

uniform

unicorn

Uni- one

uniform-one outfit worn by many

unicorn-mythical animal with one horn

bi–

bicycle

biannual

bi–two

bicycle–has two wheels

biannual–happens two times a year

tri-

tripod

triathlon

tri-three

tripod-stand with three leg

triatalon-race with three parts

Cent-

century

centigram

Cent- a Latin word meaning 100

century-100 years

centigram-a unit of measurement that equals 100 grams

dec- 

decade

decathlon

dec- ten

• decade-ten years
• decathlon-athletic contest with ten events

mono- 

monotheism

monotone

monochromatic

mono- one

monotheism-belief in one god

monotone-singing in one tone

monochromatic- one color (may be different shades of that color)

multi- 

multicolored

multifamily

multi- many

multicolored-many colors

multifamily-many families are included

col-

collected

collide

col-{with or together}

collected-brought or place together 

collide-when two or more things come together forcefully 

pent-

Pentagon

pentatonic

pent-  five

Pentagon-building with five sides (building which houses the administrative offices for our country's military)

Pentatonic-scale in music with only five notes. (Pentatonix-musical group with 5 members who sing five part harmony)

poly- 

Polytheism 

polygon

poly-many 

polytheism-belief in many gods

polygon- a plane figure with at least three straight sides and angles , and typically five or more. 

QUAD-

Quadruple

Quadrant

QUAD- 4

Quadruple- consisting of 4 parts or elements 

Quadrants- Each of 4 quarters of a circle 

semi- 

semicircle

semicolon

semi- half

• semicircle-half a circle
• semicolon-half colon, half comma

ir- used before words that start with the letter r

irregular

irreparable

ir- not

irregular- not regular

irreparable- not able to be repaired

De-

deactivate 

dehydration

De-

lack of something or removing 

deactivate- to make something inactive by removing or destroying it.

Dehydrate- to remove water from something