A prefix is an affix which is placed before at the initial position of a root or stem to modify or change its meaning. The word prefix is itself made up of the stem fix (meaning attach, in this case), and the prefix pre- (meaning “before”), both of them are derived from Latin roots.
Prefix
|
Meaning
|
Example
|
pre-
|
before
|
pre-war
|
post-
|
after
|
post-war
|
re-
|
again, back
|
rebuild, replace
|
super-
|
above
more than
|
superhuman
|
over
|
too much
|
overheat
|
un-
|
reverse
the action
|
unpack
|
dis-
|
distrust
|
|
mis-
|
wrongly
|
misinform
|
mal-
|
badly, bad
|
maltreat
|
be-
|
complete, around,
about, away, cover with
|
bewitch, becalm
|
en-
|
make into, put into, get into
|
endanger
|
em-
|
empower
|
|
uni-
|
one
|
uniform
|
mono-
|
monotone
|
|
bi-
|
two
|
bilingual
|
tri-
|
three
|
tricolor
|
il-
|
negative/opposite
|
illiterate
|
im-
|
impersonal
|
|
in-
|
indoors
|
|
ir-
|
irregular
|
|
multi-
|
many
|
multi-racial
|
poly-
|
polyclinic
|
|
inter
|
between
|
international
|
sub
|
under
|
submerge
|
non
|
not
|
non-sense
|
anti
|
against, opposing
|
antibacterial
|
counter-
|
opposite/ opposed to
|
counterproductive
|
de-
|
something is removed or reduced
|
deactivate, decode
|
down, away
|
descend
|
|
ex-
|
out of
|
exhale
|
extra-
|
outside/beyond
|
extra-curricular
|
fore-
|
before
|
foreground
|
homo-
|
same
|
homosexual
|
hyper-
|
very/extremely
|
hyperlink
|
mid-
|
middle
|
midweek
|
neo-
|
new
|
neoclassical
|
omni-
|
all
|
omnivore
|
out-
|
outside/beyond/bigger
|
outweigh
|
semi-
|
half
|
semicircle
|
under-
|
beneath/not enough
|
underplay
|
down-
|
reduce or lower
|
downgrade
|
tele-
|
at a distance
|
television
|
trans-
|
across
|
transatlantic
|
ultra-
|
extremely
|
ultrasound
|
co-
|
with
|
co-exist
|
deca-
|
ten times a unit
|
decathlon
|
hetero-
|
different, other
|
heterosexual
|
macro-
|
large, prominent
|
macrostructure
|
micro-
|
very small
|
microscope
|
up-
|
to the top or north, higher/better
|
upgrade
|
by-
|
near to, next to
|
bypass
|
off-
|
non-standard, away
|
offset
|
on-
|
immediate proximity, locative
|
onset
|
self-
|
self
|
self-esteem
|
hemi-
|
half
|
hemisphere
|
hypo-
|
under
|
hypodermic
|
infra-
|
below
|
infrastructure
|
inter-
|
between, among
|
interchange
|
intra-
|
inside, within
|
intramural
|
peri-
|
round, about
|
perimeter
|
dys-
|
bad, ill
|
dysfunction
|
meta-
|
after, beyond, with; changing
|
metaphysics
|
para-
|
beside, near
|
paranormal
|
com-
|
with, together, in association
|
combat
|
contra-
|
against, opposite
|
contradiction
|
dia-
|
through, across
|
diameter
|
sub-
|
at a lower position
|
submarine
|
kilo-
|
one thousand times a unit
|
kilogram
|
mega-
|
one million times a unit
|
megabyte
|
giga-
|
one billion units
|
gigawatt
|
deci-
|
one tenth of a unit
|
decimetre
|
centi-
|
one hundredth of a unit
|
centilitre
|
milli-
|
one thousandth of a unit
|
millimetre
|
micro-
|
one millionth of a unit (also means extremely small)
|
micromedia
|
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